1 /* Output variables, constants and external declarations, for GNU compiler.
2 Copyright (C) 1987-2015 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
21 /* This file handles generation of all the assembler code
22 *except* the instructions of a function.
23 This includes declarations of variables and their initial values.
25 We also output the assembler code for constants stored in memory
26 and are responsible for combining constants with the same value. */
30 #include "coretypes.h"
36 #include "fold-const.h"
37 #include "stor-layout.h"
38 #include "stringpool.h"
41 #include "hard-reg-set.h"
43 #include "insn-config.h"
53 #include "diagnostic-core.h"
54 #include "langhooks.h"
58 #include "common/common-target.h"
59 #include "targhooks.h"
61 #include "dominance.h"
63 #include "basic-block.h"
64 #include "plugin-api.h"
69 #include "tree-chkp.h"
71 #ifdef XCOFF_DEBUGGING_INFO
72 #include "xcoffout.h" /* Needed for external data
73 declarations for e.g. AIX 4.x. */
76 /* The (assembler) name of the first globally-visible object output. */
77 extern GTY(()) const char *first_global_object_name
;
78 extern GTY(()) const char *weak_global_object_name
;
80 const char *first_global_object_name
;
81 const char *weak_global_object_name
;
84 struct constant_descriptor_rtx
;
85 struct rtx_constant_pool
;
87 #define n_deferred_constants (crtl->varasm.deferred_constants)
89 /* Number for making the label on the next
90 constant that is stored in memory. */
92 static GTY(()) int const_labelno
;
94 /* Carry information from ASM_DECLARE_OBJECT_NAME
95 to ASM_FINISH_DECLARE_OBJECT. */
97 int size_directive_output
;
99 /* The last decl for which assemble_variable was called,
100 if it did ASM_DECLARE_OBJECT_NAME.
101 If the last call to assemble_variable didn't do that,
104 tree last_assemble_variable_decl
;
106 /* The following global variable indicates if the first basic block
107 in a function belongs to the cold partition or not. */
109 bool first_function_block_is_cold
;
111 /* Whether we saw any functions with no_split_stack. */
113 static bool saw_no_split_stack
;
115 static const char *strip_reg_name (const char *);
116 static int contains_pointers_p (tree
);
117 #ifdef ASM_OUTPUT_EXTERNAL
118 static bool incorporeal_function_p (tree
);
120 static void decode_addr_const (tree
, struct addr_const
*);
121 static hashval_t
const_hash_1 (const tree
);
122 static int compare_constant (const tree
, const tree
);
123 static void output_constant_def_contents (rtx
);
124 static void output_addressed_constants (tree
);
125 static unsigned HOST_WIDE_INT
output_constant (tree
, unsigned HOST_WIDE_INT
,
127 static void globalize_decl (tree
);
128 static bool decl_readonly_section_1 (enum section_category
);
129 #ifdef BSS_SECTION_ASM_OP
130 #ifdef ASM_OUTPUT_ALIGNED_BSS
131 static void asm_output_aligned_bss (FILE *, tree
, const char *,
132 unsigned HOST_WIDE_INT
, int)
135 #endif /* BSS_SECTION_ASM_OP */
136 static void mark_weak (tree
);
137 static void output_constant_pool (const char *, tree
);
139 /* Well-known sections, each one associated with some sort of *_ASM_OP. */
140 section
*text_section
;
141 section
*data_section
;
142 section
*readonly_data_section
;
143 section
*sdata_section
;
144 section
*ctors_section
;
145 section
*dtors_section
;
146 section
*bss_section
;
147 section
*sbss_section
;
149 /* Various forms of common section. All are guaranteed to be nonnull. */
150 section
*tls_comm_section
;
151 section
*comm_section
;
152 section
*lcomm_section
;
154 /* A SECTION_NOSWITCH section used for declaring global BSS variables.
156 section
*bss_noswitch_section
;
158 /* The section that holds the main exception table, when known. The section
159 is set either by the target's init_sections hook or by the first call to
160 switch_to_exception_section. */
161 section
*exception_section
;
163 /* The section that holds the DWARF2 frame unwind information, when known.
164 The section is set either by the target's init_sections hook or by the
165 first call to switch_to_eh_frame_section. */
166 section
*eh_frame_section
;
168 /* asm_out_file's current section. This is NULL if no section has yet
169 been selected or if we lose track of what the current section is. */
172 /* True if code for the current function is currently being directed
173 at the cold section. */
174 bool in_cold_section_p
;
176 /* The following global holds the "function name" for the code in the
177 cold section of a function, if hot/cold function splitting is enabled
178 and there was actually code that went into the cold section. A
179 pseudo function name is needed for the cold section of code for some
180 debugging tools that perform symbolization. */
181 tree cold_function_name
= NULL_TREE
;
183 /* A linked list of all the unnamed sections. */
184 static GTY(()) section
*unnamed_sections
;
186 /* Return a nonzero value if DECL has a section attribute. */
187 #define IN_NAMED_SECTION(DECL) \
188 ((TREE_CODE (DECL) == FUNCTION_DECL || TREE_CODE (DECL) == VAR_DECL) \
189 && DECL_SECTION_NAME (DECL) != NULL)
191 struct section_hasher
: ggc_ptr_hash
<section
>
193 typedef const char *compare_type
;
195 static hashval_t
hash (section
*);
196 static bool equal (section
*, const char *);
199 /* Hash table of named sections. */
200 static GTY(()) hash_table
<section_hasher
> *section_htab
;
202 struct object_block_hasher
: ggc_ptr_hash
<object_block
>
204 typedef const section
*compare_type
;
206 static hashval_t
hash (object_block
*);
207 static bool equal (object_block
*, const section
*);
210 /* A table of object_blocks, indexed by section. */
211 static GTY(()) hash_table
<object_block_hasher
> *object_block_htab
;
213 /* The next number to use for internal anchor labels. */
214 static GTY(()) int anchor_labelno
;
216 /* A pool of constants that can be shared between functions. */
217 static GTY(()) struct rtx_constant_pool
*shared_constant_pool
;
219 /* Helper routines for maintaining section_htab. */
222 section_hasher::equal (section
*old
, const char *new_name
)
224 return strcmp (old
->named
.name
, new_name
) == 0;
228 section_hasher::hash (section
*old
)
230 return htab_hash_string (old
->named
.name
);
233 /* Return a hash value for section SECT. */
236 hash_section (section
*sect
)
238 if (sect
->common
.flags
& SECTION_NAMED
)
239 return htab_hash_string (sect
->named
.name
);
240 return sect
->common
.flags
;
243 /* Helper routines for maintaining object_block_htab. */
246 object_block_hasher::equal (object_block
*old
, const section
*new_section
)
248 return old
->sect
== new_section
;
252 object_block_hasher::hash (object_block
*old
)
254 return hash_section (old
->sect
);
257 /* Return a new unnamed section with the given fields. */
260 get_unnamed_section (unsigned int flags
, void (*callback
) (const void *),
265 sect
= ggc_alloc
<section
> ();
266 sect
->unnamed
.common
.flags
= flags
| SECTION_UNNAMED
;
267 sect
->unnamed
.callback
= callback
;
268 sect
->unnamed
.data
= data
;
269 sect
->unnamed
.next
= unnamed_sections
;
271 unnamed_sections
= sect
;
275 /* Return a SECTION_NOSWITCH section with the given fields. */
278 get_noswitch_section (unsigned int flags
, noswitch_section_callback callback
)
282 sect
= ggc_alloc
<section
> ();
283 sect
->noswitch
.common
.flags
= flags
| SECTION_NOSWITCH
;
284 sect
->noswitch
.callback
= callback
;
289 /* Return the named section structure associated with NAME. Create
290 a new section with the given fields if no such structure exists. */
293 get_section (const char *name
, unsigned int flags
, tree decl
)
295 section
*sect
, **slot
;
297 slot
= section_htab
->find_slot_with_hash (name
, htab_hash_string (name
),
299 flags
|= SECTION_NAMED
;
302 sect
= ggc_alloc
<section
> ();
303 sect
->named
.common
.flags
= flags
;
304 sect
->named
.name
= ggc_strdup (name
);
305 sect
->named
.decl
= decl
;
311 if ((sect
->common
.flags
& ~SECTION_DECLARED
) != flags
312 && ((sect
->common
.flags
| flags
) & SECTION_OVERRIDE
) == 0)
314 /* It is fine if one of the section flags is
315 SECTION_WRITE | SECTION_RELRO and the other has none of these
316 flags (i.e. read-only) in named sections and either the
317 section hasn't been declared yet or has been declared as writable.
318 In that case just make sure the resulting flags are
319 SECTION_WRITE | SECTION_RELRO, ie. writable only because of
321 if (((sect
->common
.flags
^ flags
) & (SECTION_WRITE
| SECTION_RELRO
))
322 == (SECTION_WRITE
| SECTION_RELRO
)
323 && (sect
->common
.flags
324 & ~(SECTION_DECLARED
| SECTION_WRITE
| SECTION_RELRO
))
325 == (flags
& ~(SECTION_WRITE
| SECTION_RELRO
))
326 && ((sect
->common
.flags
& SECTION_DECLARED
) == 0
327 || (sect
->common
.flags
& SECTION_WRITE
)))
329 sect
->common
.flags
|= (SECTION_WRITE
| SECTION_RELRO
);
332 /* Sanity check user variables for flag changes. */
333 if (sect
->named
.decl
!= NULL
334 && DECL_P (sect
->named
.decl
)
335 && decl
!= sect
->named
.decl
)
337 if (decl
!= NULL
&& DECL_P (decl
))
338 error ("%+D causes a section type conflict with %D",
339 decl
, sect
->named
.decl
);
341 error ("section type conflict with %D", sect
->named
.decl
);
342 inform (DECL_SOURCE_LOCATION (sect
->named
.decl
),
343 "%qD was declared here", sect
->named
.decl
);
345 else if (decl
!= NULL
&& DECL_P (decl
))
346 error ("%+D causes a section type conflict", decl
);
348 error ("section type conflict");
349 /* Make sure we don't error about one section multiple times. */
350 sect
->common
.flags
|= SECTION_OVERRIDE
;
356 /* Return true if the current compilation mode benefits from having
357 objects grouped into blocks. */
360 use_object_blocks_p (void)
362 return flag_section_anchors
;
365 /* Return the object_block structure for section SECT. Create a new
366 structure if we haven't created one already. Return null if SECT
369 static struct object_block
*
370 get_block_for_section (section
*sect
)
372 struct object_block
*block
;
378 = object_block_htab
->find_slot_with_hash (sect
, hash_section (sect
),
383 block
= ggc_cleared_alloc
<object_block
> ();
390 /* Create a symbol with label LABEL and place it at byte offset
391 OFFSET in BLOCK. OFFSET can be negative if the symbol's offset
392 is not yet known. LABEL must be a garbage-collected string. */
395 create_block_symbol (const char *label
, struct object_block
*block
,
396 HOST_WIDE_INT offset
)
401 /* Create the extended SYMBOL_REF. */
402 size
= RTX_HDR_SIZE
+ sizeof (struct block_symbol
);
403 symbol
= (rtx
) ggc_internal_alloc (size
);
405 /* Initialize the normal SYMBOL_REF fields. */
406 memset (symbol
, 0, size
);
407 PUT_CODE (symbol
, SYMBOL_REF
);
408 PUT_MODE (symbol
, Pmode
);
409 XSTR (symbol
, 0) = label
;
410 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_HAS_BLOCK_INFO
;
412 /* Initialize the block_symbol stuff. */
413 SYMBOL_REF_BLOCK (symbol
) = block
;
414 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
419 /* Return a section with a particular name and with whatever SECTION_*
420 flags section_type_flags deems appropriate. The name of the section
421 is taken from NAME if nonnull, otherwise it is taken from DECL's
422 DECL_SECTION_NAME. DECL is the decl associated with the section
423 (see the section comment for details) and RELOC is as for
424 section_type_flags. */
427 get_named_section (tree decl
, const char *name
, int reloc
)
433 gcc_assert (decl
&& DECL_P (decl
) && DECL_SECTION_NAME (decl
));
434 name
= DECL_SECTION_NAME (decl
);
437 flags
= targetm
.section_type_flags (decl
, name
, reloc
);
438 return get_section (name
, flags
, decl
);
441 /* Worker for resolve_unique_section. */
444 set_implicit_section (struct symtab_node
*n
, void *data ATTRIBUTE_UNUSED
)
446 n
->implicit_section
= true;
450 /* If required, set DECL_SECTION_NAME to a unique name. */
453 resolve_unique_section (tree decl
, int reloc ATTRIBUTE_UNUSED
,
454 int flag_function_or_data_sections
)
456 if (DECL_SECTION_NAME (decl
) == NULL
457 && targetm_common
.have_named_sections
458 && (flag_function_or_data_sections
459 || DECL_COMDAT_GROUP (decl
)))
461 targetm
.asm_out
.unique_section (decl
, reloc
);
462 if (DECL_SECTION_NAME (decl
))
463 symtab_node::get (decl
)->call_for_symbol_and_aliases
464 (set_implicit_section
, NULL
, true);
468 #ifdef BSS_SECTION_ASM_OP
470 #ifdef ASM_OUTPUT_ALIGNED_BSS
472 /* Utility function for targets to use in implementing
473 ASM_OUTPUT_ALIGNED_BSS.
474 ??? It is believed that this function will work in most cases so such
475 support is localized here. */
478 asm_output_aligned_bss (FILE *file
, tree decl ATTRIBUTE_UNUSED
,
479 const char *name
, unsigned HOST_WIDE_INT size
,
482 switch_to_section (bss_section
);
483 ASM_OUTPUT_ALIGN (file
, floor_log2 (align
/ BITS_PER_UNIT
));
484 #ifdef ASM_DECLARE_OBJECT_NAME
485 last_assemble_variable_decl
= decl
;
486 ASM_DECLARE_OBJECT_NAME (file
, name
, decl
);
488 /* Standard thing is just output label for the object. */
489 ASM_OUTPUT_LABEL (file
, name
);
490 #endif /* ASM_DECLARE_OBJECT_NAME */
491 ASM_OUTPUT_SKIP (file
, size
? size
: 1);
496 #endif /* BSS_SECTION_ASM_OP */
498 #ifndef USE_SELECT_SECTION_FOR_FUNCTIONS
499 /* Return the hot section for function DECL. Return text_section for
503 hot_function_section (tree decl
)
505 if (decl
!= NULL_TREE
506 && DECL_SECTION_NAME (decl
) != NULL
507 && targetm_common
.have_named_sections
)
508 return get_named_section (decl
, NULL
, 0);
514 /* Return section for TEXT_SECTION_NAME if DECL or DECL_SECTION_NAME (DECL)
517 When DECL_SECTION_NAME is non-NULL and it is implicit section and
518 NAMED_SECTION_SUFFIX is non-NULL, then produce section called
519 concatenate the name with NAMED_SECTION_SUFFIX.
520 Otherwise produce "TEXT_SECTION_NAME.IMPLICIT_NAME". */
523 get_named_text_section (tree decl
,
524 const char *text_section_name
,
525 const char *named_section_suffix
)
527 if (decl
&& DECL_SECTION_NAME (decl
))
529 if (named_section_suffix
)
531 const char *dsn
= DECL_SECTION_NAME (decl
);
532 const char *stripped_name
;
535 name
= (char *) alloca (strlen (dsn
) + 1);
539 stripped_name
= targetm
.strip_name_encoding (name
);
541 buffer
= ACONCAT ((stripped_name
, named_section_suffix
, NULL
));
542 return get_named_section (decl
, buffer
, 0);
544 else if (symtab_node::get (decl
)->implicit_section
)
548 /* Do not try to split gnu_linkonce functions. This gets somewhat
550 if (DECL_COMDAT_GROUP (decl
) && !HAVE_COMDAT_GROUP
)
552 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
553 name
= targetm
.strip_name_encoding (name
);
554 return get_named_section (decl
, ACONCAT ((text_section_name
, ".",
560 return get_named_section (decl
, text_section_name
, 0);
563 /* Choose named function section based on its frequency. */
566 default_function_section (tree decl
, enum node_frequency freq
,
567 bool startup
, bool exit
)
569 #if defined HAVE_LD_EH_GC_SECTIONS && defined HAVE_LD_EH_GC_SECTIONS_BUG
570 /* Old GNU linkers have buggy --gc-section support, which sometimes
571 results in .gcc_except_table* sections being garbage collected. */
573 && symtab_node::get (decl
)->implicit_section
)
577 if (!flag_reorder_functions
578 || !targetm_common
.have_named_sections
)
580 /* Startup code should go to startup subsection unless it is
581 unlikely executed (this happens especially with function splitting
582 where we can split away unnecessary parts of static constructors. */
583 if (startup
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
585 /* If we do have a profile or(and) LTO phase is executed, we do not need
586 these ELF section. */
587 if (!in_lto_p
|| !flag_profile_values
)
588 return get_named_text_section (decl
, ".text.startup", NULL
);
593 /* Similarly for exit. */
594 if (exit
&& freq
!= NODE_FREQUENCY_UNLIKELY_EXECUTED
)
595 return get_named_text_section (decl
, ".text.exit", NULL
);
597 /* Group cold functions together, similarly for hot code. */
600 case NODE_FREQUENCY_UNLIKELY_EXECUTED
:
601 return get_named_text_section (decl
, ".text.unlikely", NULL
);
602 case NODE_FREQUENCY_HOT
:
603 /* If we do have a profile or(and) LTO phase is executed, we do not need
604 these ELF section. */
605 if (!in_lto_p
|| !flag_profile_values
)
606 return get_named_text_section (decl
, ".text.hot", NULL
);
612 /* Return the section for function DECL.
614 If DECL is NULL_TREE, return the text section. We can be passed
615 NULL_TREE under some circumstances by dbxout.c at least.
617 If FORCE_COLD is true, return cold function section ignoring
618 the frequency info of cgraph_node. */
621 function_section_1 (tree decl
, bool force_cold
)
623 section
*section
= NULL
;
624 enum node_frequency freq
= NODE_FREQUENCY_NORMAL
;
625 bool startup
= false, exit
= false;
629 struct cgraph_node
*node
= cgraph_node::get (decl
);
633 freq
= node
->frequency
;
634 startup
= node
->only_called_at_startup
;
635 exit
= node
->only_called_at_exit
;
639 freq
= NODE_FREQUENCY_UNLIKELY_EXECUTED
;
641 #ifdef USE_SELECT_SECTION_FOR_FUNCTIONS
642 if (decl
!= NULL_TREE
643 && DECL_SECTION_NAME (decl
) != NULL
)
645 if (targetm
.asm_out
.function_section
)
646 section
= targetm
.asm_out
.function_section (decl
, freq
,
650 return get_named_section (decl
, NULL
, 0);
653 return targetm
.asm_out
.select_section
654 (decl
, freq
== NODE_FREQUENCY_UNLIKELY_EXECUTED
,
655 symtab_node::get (decl
)->definition_alignment ());
657 if (targetm
.asm_out
.function_section
)
658 section
= targetm
.asm_out
.function_section (decl
, freq
, startup
, exit
);
661 return hot_function_section (decl
);
665 /* Return the section for function DECL.
667 If DECL is NULL_TREE, return the text section. We can be passed
668 NULL_TREE under some circumstances by dbxout.c at least. */
671 function_section (tree decl
)
673 /* Handle cases where function splitting code decides
674 to put function entry point into unlikely executed section
675 despite the fact that the function itself is not cold
676 (i.e. it is called rarely but contains a hot loop that is
677 better to live in hot subsection for the code locality). */
678 return function_section_1 (decl
,
679 first_function_block_is_cold
);
682 /* Return the section for the current function, take IN_COLD_SECTION_P
686 current_function_section (void)
688 return function_section_1 (current_function_decl
, in_cold_section_p
);
691 /* Tell assembler to switch to unlikely-to-be-executed text section. */
694 unlikely_text_section (void)
696 return function_section_1 (current_function_decl
, true);
699 /* When called within a function context, return true if the function
700 has been assigned a cold text section and if SECT is that section.
701 When called outside a function context, return true if SECT is the
702 default cold section. */
705 unlikely_text_section_p (section
*sect
)
707 return sect
== function_section_1 (current_function_decl
, true);
710 /* Return the read-only data section associated with function DECL. */
713 default_function_rodata_section (tree decl
)
715 if (decl
!= NULL_TREE
&& DECL_SECTION_NAME (decl
))
717 const char *name
= DECL_SECTION_NAME (decl
);
719 if (DECL_COMDAT_GROUP (decl
) && HAVE_COMDAT_GROUP
)
725 dot
= strchr (name
+ 1, '.');
728 len
= strlen (dot
) + 8;
729 rname
= (char *) alloca (len
);
731 strcpy (rname
, ".rodata");
733 return get_section (rname
, SECTION_LINKONCE
, decl
);
735 /* For .gnu.linkonce.t.foo we want to use .gnu.linkonce.r.foo. */
736 else if (DECL_COMDAT_GROUP (decl
)
737 && strncmp (name
, ".gnu.linkonce.t.", 16) == 0)
739 size_t len
= strlen (name
) + 1;
740 char *rname
= (char *) alloca (len
);
742 memcpy (rname
, name
, len
);
744 return get_section (rname
, SECTION_LINKONCE
, decl
);
746 /* For .text.foo we want to use .rodata.foo. */
747 else if (flag_function_sections
&& flag_data_sections
748 && strncmp (name
, ".text.", 6) == 0)
750 size_t len
= strlen (name
) + 1;
751 char *rname
= (char *) alloca (len
+ 2);
753 memcpy (rname
, ".rodata", 7);
754 memcpy (rname
+ 7, name
+ 5, len
- 5);
755 return get_section (rname
, 0, decl
);
759 return readonly_data_section
;
762 /* Return the read-only data section associated with function DECL
763 for targets where that section should be always the single
764 readonly data section. */
767 default_no_function_rodata_section (tree decl ATTRIBUTE_UNUSED
)
769 return readonly_data_section
;
772 /* A subroutine of mergeable_string_section and mergeable_constant_section. */
775 function_mergeable_rodata_prefix (void)
777 section
*s
= targetm
.asm_out
.function_rodata_section (current_function_decl
);
778 if (SECTION_STYLE (s
) == SECTION_NAMED
)
779 return s
->named
.name
;
781 return targetm
.asm_out
.mergeable_rodata_prefix
;
784 /* Return the section to use for string merging. */
787 mergeable_string_section (tree decl ATTRIBUTE_UNUSED
,
788 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
789 unsigned int flags ATTRIBUTE_UNUSED
)
793 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
794 && TREE_CODE (decl
) == STRING_CST
795 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
797 && (len
= int_size_in_bytes (TREE_TYPE (decl
))) > 0
798 && TREE_STRING_LENGTH (decl
) >= len
)
801 unsigned int modesize
;
805 const char *prefix
= function_mergeable_rodata_prefix ();
806 char *name
= (char *) alloca (strlen (prefix
) + 30);
808 mode
= TYPE_MODE (TREE_TYPE (TREE_TYPE (decl
)));
809 modesize
= GET_MODE_BITSIZE (mode
);
810 if (modesize
>= 8 && modesize
<= 256
811 && (modesize
& (modesize
- 1)) == 0)
813 if (align
< modesize
)
816 str
= TREE_STRING_POINTER (decl
);
817 unit
= GET_MODE_SIZE (mode
);
819 /* Check for embedded NUL characters. */
820 for (i
= 0; i
< len
; i
+= unit
)
822 for (j
= 0; j
< unit
; j
++)
823 if (str
[i
+ j
] != '\0')
830 sprintf (name
, "%s.str%d.%d", prefix
,
831 modesize
/ 8, (int) (align
/ 8));
832 flags
|= (modesize
/ 8) | SECTION_MERGE
| SECTION_STRINGS
;
833 return get_section (name
, flags
, NULL
);
838 return readonly_data_section
;
841 /* Return the section to use for constant merging. */
844 mergeable_constant_section (machine_mode mode ATTRIBUTE_UNUSED
,
845 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
,
846 unsigned int flags ATTRIBUTE_UNUSED
)
848 unsigned int modesize
= GET_MODE_BITSIZE (mode
);
850 if (HAVE_GAS_SHF_MERGE
&& flag_merge_constants
856 && (align
& (align
- 1)) == 0)
858 const char *prefix
= function_mergeable_rodata_prefix ();
859 char *name
= (char *) alloca (strlen (prefix
) + 30);
861 sprintf (name
, "%s.cst%d", prefix
, (int) (align
/ 8));
862 flags
|= (align
/ 8) | SECTION_MERGE
;
863 return get_section (name
, flags
, NULL
);
865 return readonly_data_section
;
868 /* Given NAME, a putative register name, discard any customary prefixes. */
871 strip_reg_name (const char *name
)
873 #ifdef REGISTER_PREFIX
874 if (!strncmp (name
, REGISTER_PREFIX
, strlen (REGISTER_PREFIX
)))
875 name
+= strlen (REGISTER_PREFIX
);
877 if (name
[0] == '%' || name
[0] == '#')
882 /* The user has asked for a DECL to have a particular name. Set (or
883 change) it in such a way that we don't prefix an underscore to
886 set_user_assembler_name (tree decl
, const char *name
)
888 char *starred
= (char *) alloca (strlen (name
) + 2);
890 strcpy (starred
+ 1, name
);
891 symtab
->change_decl_assembler_name (decl
, get_identifier (starred
));
892 SET_DECL_RTL (decl
, NULL_RTX
);
895 /* Decode an `asm' spec for a declaration as a register name.
896 Return the register number, or -1 if nothing specified,
897 or -2 if the ASMSPEC is not `cc' or `memory' and is not recognized,
898 or -3 if ASMSPEC is `cc' and is not recognized,
899 or -4 if ASMSPEC is `memory' and is not recognized.
900 Accept an exact spelling or a decimal number.
901 Prefixes such as % are optional. */
904 decode_reg_name_and_count (const char *asmspec
, int *pnregs
)
906 /* Presume just one register is clobbered. */
913 /* Get rid of confusing prefixes. */
914 asmspec
= strip_reg_name (asmspec
);
916 /* Allow a decimal number as a "register name". */
917 for (i
= strlen (asmspec
) - 1; i
>= 0; i
--)
918 if (! ISDIGIT (asmspec
[i
]))
920 if (asmspec
[0] != 0 && i
< 0)
923 if (i
< FIRST_PSEUDO_REGISTER
&& i
>= 0 && reg_names
[i
][0])
929 for (i
= 0; i
< FIRST_PSEUDO_REGISTER
; i
++)
931 && ! strcmp (asmspec
, strip_reg_name (reg_names
[i
])))
934 #ifdef OVERLAPPING_REGISTER_NAMES
938 const char *const name
;
941 } table
[] = OVERLAPPING_REGISTER_NAMES
;
943 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
945 && ! strcmp (asmspec
, table
[i
].name
))
947 *pnregs
= table
[i
].nregs
;
948 return table
[i
].number
;
951 #endif /* OVERLAPPING_REGISTER_NAMES */
953 #ifdef ADDITIONAL_REGISTER_NAMES
955 static const struct { const char *const name
; const int number
; } table
[]
956 = ADDITIONAL_REGISTER_NAMES
;
958 for (i
= 0; i
< (int) ARRAY_SIZE (table
); i
++)
960 && ! strcmp (asmspec
, table
[i
].name
)
961 && reg_names
[table
[i
].number
][0])
962 return table
[i
].number
;
964 #endif /* ADDITIONAL_REGISTER_NAMES */
966 if (!strcmp (asmspec
, "memory"))
969 if (!strcmp (asmspec
, "cc"))
979 decode_reg_name (const char *name
)
982 return decode_reg_name_and_count (name
, &count
);
986 /* Return true if DECL's initializer is suitable for a BSS section. */
989 bss_initializer_p (const_tree decl
)
991 return (DECL_INITIAL (decl
) == NULL
992 /* In LTO we have no errors in program; error_mark_node is used
993 to mark offlined constructors. */
994 || (DECL_INITIAL (decl
) == error_mark_node
996 || (flag_zero_initialized_in_bss
997 /* Leave constant zeroes in .rodata so they
999 && !TREE_READONLY (decl
)
1000 && initializer_zerop (DECL_INITIAL (decl
))));
1003 /* Compute the alignment of variable specified by DECL.
1004 DONT_OUTPUT_DATA is from assemble_variable. */
1007 align_variable (tree decl
, bool dont_output_data
)
1009 unsigned int align
= DECL_ALIGN (decl
);
1011 /* In the case for initialing an array whose length isn't specified,
1012 where we have not yet been able to do the layout,
1013 figure out the proper alignment now. */
1014 if (dont_output_data
&& DECL_SIZE (decl
) == 0
1015 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
1016 align
= MAX (align
, TYPE_ALIGN (TREE_TYPE (TREE_TYPE (decl
))));
1018 /* Some object file formats have a maximum alignment which they support.
1019 In particular, a.out format supports a maximum alignment of 4. */
1020 if (align
> MAX_OFILE_ALIGNMENT
)
1022 error ("alignment of %q+D is greater than maximum object "
1023 "file alignment %d", decl
,
1024 MAX_OFILE_ALIGNMENT
/BITS_PER_UNIT
);
1025 align
= MAX_OFILE_ALIGNMENT
;
1028 if (! DECL_USER_ALIGN (decl
))
1030 #ifdef DATA_ABI_ALIGNMENT
1031 unsigned int data_abi_align
1032 = DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1033 /* For backwards compatibility, don't assume the ABI alignment for
1035 if (! DECL_THREAD_LOCAL_P (decl
) || data_abi_align
<= BITS_PER_WORD
)
1036 align
= data_abi_align
;
1039 /* On some machines, it is good to increase alignment sometimes.
1040 But as DECL_ALIGN is used both for actually emitting the variable
1041 and for code accessing the variable as guaranteed alignment, we
1042 can only increase the alignment if it is a performance optimization
1043 if the references to it must bind to the current definition. */
1044 if (decl_binds_to_current_def_p (decl
)
1045 && !DECL_VIRTUAL_P (decl
))
1047 #ifdef DATA_ALIGNMENT
1048 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1049 /* Don't increase alignment too much for TLS variables - TLS space
1051 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1054 #ifdef CONSTANT_ALIGNMENT
1055 if (DECL_INITIAL (decl
) != 0
1056 /* In LTO we have no errors in program; error_mark_node is used
1057 to mark offlined constructors. */
1058 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1060 unsigned int const_align
1061 = CONSTANT_ALIGNMENT (DECL_INITIAL (decl
), align
);
1062 /* Don't increase alignment too much for TLS variables - TLS
1063 space is too precious. */
1064 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1065 align
= const_align
;
1071 /* Reset the alignment in case we have made it tighter, so we can benefit
1072 from it in get_pointer_alignment. */
1073 DECL_ALIGN (decl
) = align
;
1076 /* Return DECL_ALIGN (decl), possibly increased for optimization purposes
1077 beyond what align_variable returned. */
1080 get_variable_align (tree decl
)
1082 unsigned int align
= DECL_ALIGN (decl
);
1084 /* For user aligned vars or static vars align_variable already did
1086 if (DECL_USER_ALIGN (decl
) || !TREE_PUBLIC (decl
))
1089 #ifdef DATA_ABI_ALIGNMENT
1090 if (DECL_THREAD_LOCAL_P (decl
))
1091 align
= DATA_ABI_ALIGNMENT (TREE_TYPE (decl
), align
);
1094 /* For decls that bind to the current definition, align_variable
1095 did also everything, except for not assuming ABI required alignment
1096 of TLS variables. For other vars, increase the alignment here
1097 as an optimization. */
1098 if (!decl_binds_to_current_def_p (decl
))
1100 /* On some machines, it is good to increase alignment sometimes. */
1101 #ifdef DATA_ALIGNMENT
1102 unsigned int data_align
= DATA_ALIGNMENT (TREE_TYPE (decl
), align
);
1103 /* Don't increase alignment too much for TLS variables - TLS space
1105 if (! DECL_THREAD_LOCAL_P (decl
) || data_align
<= BITS_PER_WORD
)
1108 #ifdef CONSTANT_ALIGNMENT
1109 if (DECL_INITIAL (decl
) != 0
1110 /* In LTO we have no errors in program; error_mark_node is used
1111 to mark offlined constructors. */
1112 && (in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
))
1114 unsigned int const_align
= CONSTANT_ALIGNMENT (DECL_INITIAL (decl
),
1116 /* Don't increase alignment too much for TLS variables - TLS space
1118 if (! DECL_THREAD_LOCAL_P (decl
) || const_align
<= BITS_PER_WORD
)
1119 align
= const_align
;
1127 /* Return the section into which the given VAR_DECL or CONST_DECL
1128 should be placed. PREFER_NOSWITCH_P is true if a noswitch
1129 section should be used wherever possible. */
1132 get_variable_section (tree decl
, bool prefer_noswitch_p
)
1134 addr_space_t as
= ADDR_SPACE_GENERIC
;
1136 varpool_node
*vnode
= varpool_node::get (decl
);
1139 vnode
= vnode
->ultimate_alias_target ();
1143 if (TREE_TYPE (decl
) != error_mark_node
)
1144 as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1146 /* We need the constructor to figure out reloc flag. */
1148 vnode
->get_constructor ();
1150 if (DECL_COMMON (decl
))
1152 /* If the decl has been given an explicit section name, or it resides
1153 in a non-generic address space, then it isn't common, and shouldn't
1154 be handled as such. */
1155 gcc_assert (DECL_SECTION_NAME (decl
) == NULL
1156 && ADDR_SPACE_GENERIC_P (as
));
1157 if (DECL_THREAD_LOCAL_P (decl
))
1158 return tls_comm_section
;
1159 else if (TREE_PUBLIC (decl
) && bss_initializer_p (decl
))
1160 return comm_section
;
1163 if (DECL_INITIAL (decl
) == error_mark_node
)
1164 reloc
= contains_pointers_p (TREE_TYPE (decl
)) ? 3 : 0;
1165 else if (DECL_INITIAL (decl
))
1166 reloc
= compute_reloc_for_constant (DECL_INITIAL (decl
));
1170 resolve_unique_section (decl
, reloc
, flag_data_sections
);
1171 if (IN_NAMED_SECTION (decl
))
1172 return get_named_section (decl
, NULL
, reloc
);
1174 if (ADDR_SPACE_GENERIC_P (as
)
1175 && !DECL_THREAD_LOCAL_P (decl
)
1176 && !(prefer_noswitch_p
&& targetm
.have_switchable_bss_sections
)
1177 && bss_initializer_p (decl
))
1179 if (!TREE_PUBLIC (decl
)
1180 && !((flag_sanitize
& SANITIZE_ADDRESS
)
1181 && asan_protect_global (decl
)))
1182 return lcomm_section
;
1183 if (bss_noswitch_section
)
1184 return bss_noswitch_section
;
1187 return targetm
.asm_out
.select_section (decl
, reloc
,
1188 get_variable_align (decl
));
1191 /* Return the block into which object_block DECL should be placed. */
1193 static struct object_block
*
1194 get_block_for_decl (tree decl
)
1198 if (TREE_CODE (decl
) == VAR_DECL
)
1200 /* The object must be defined in this translation unit. */
1201 if (DECL_EXTERNAL (decl
))
1204 /* There's no point using object blocks for something that is
1205 isolated by definition. */
1206 if (DECL_COMDAT_GROUP (decl
))
1210 /* We can only calculate block offsets if the decl has a known
1212 if (DECL_SIZE_UNIT (decl
) == NULL
)
1214 if (!tree_fits_uhwi_p (DECL_SIZE_UNIT (decl
)))
1217 /* Find out which section should contain DECL. We cannot put it into
1218 an object block if it requires a standalone definition. */
1219 if (TREE_CODE (decl
) == VAR_DECL
)
1220 align_variable (decl
, 0);
1221 sect
= get_variable_section (decl
, true);
1222 if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
1225 return get_block_for_section (sect
);
1228 /* Make sure block symbol SYMBOL is in block BLOCK. */
1231 change_symbol_block (rtx symbol
, struct object_block
*block
)
1233 if (block
!= SYMBOL_REF_BLOCK (symbol
))
1235 gcc_assert (SYMBOL_REF_BLOCK_OFFSET (symbol
) < 0);
1236 SYMBOL_REF_BLOCK (symbol
) = block
;
1240 /* Return true if it is possible to put DECL in an object_block. */
1243 use_blocks_for_decl_p (tree decl
)
1245 struct symtab_node
*snode
;
1247 /* Only data DECLs can be placed into object blocks. */
1248 if (TREE_CODE (decl
) != VAR_DECL
&& TREE_CODE (decl
) != CONST_DECL
)
1251 /* Detect decls created by dw2_force_const_mem. Such decls are
1252 special because DECL_INITIAL doesn't specify the decl's true value.
1253 dw2_output_indirect_constants will instead call assemble_variable
1254 with dont_output_data set to 1 and then print the contents itself. */
1255 if (DECL_INITIAL (decl
) == decl
)
1258 /* If this decl is an alias, then we don't want to emit a
1260 if (TREE_CODE (decl
) == VAR_DECL
1261 && (snode
= symtab_node::get (decl
)) != NULL
1265 return targetm
.use_blocks_for_decl_p (decl
);
1268 /* Follow the IDENTIFIER_TRANSPARENT_ALIAS chain starting at *ALIAS
1269 until we find an identifier that is not itself a transparent alias.
1270 Modify the alias passed to it by reference (and all aliases on the
1271 way to the ultimate target), such that they do not have to be
1272 followed again, and return the ultimate target of the alias
1276 ultimate_transparent_alias_target (tree
*alias
)
1278 tree target
= *alias
;
1280 if (IDENTIFIER_TRANSPARENT_ALIAS (target
))
1282 gcc_assert (TREE_CHAIN (target
));
1283 target
= ultimate_transparent_alias_target (&TREE_CHAIN (target
));
1284 gcc_assert (! IDENTIFIER_TRANSPARENT_ALIAS (target
)
1285 && ! TREE_CHAIN (target
));
1292 /* Create the DECL_RTL for a VAR_DECL or FUNCTION_DECL. DECL should
1293 have static storage duration. In other words, it should not be an
1294 automatic variable, including PARM_DECLs.
1296 There is, however, one exception: this function handles variables
1297 explicitly placed in a particular register by the user.
1299 This is never called for PARM_DECL nodes. */
1302 make_decl_rtl (tree decl
)
1304 const char *name
= 0;
1309 /* Check that we are not being given an automatic variable. */
1310 gcc_assert (TREE_CODE (decl
) != PARM_DECL
1311 && TREE_CODE (decl
) != RESULT_DECL
);
1313 /* A weak alias has TREE_PUBLIC set but not the other bits. */
1314 gcc_assert (TREE_CODE (decl
) != VAR_DECL
1315 || TREE_STATIC (decl
)
1316 || TREE_PUBLIC (decl
)
1317 || DECL_EXTERNAL (decl
)
1318 || DECL_REGISTER (decl
));
1320 /* And that we were not given a type or a label. */
1321 gcc_assert (TREE_CODE (decl
) != TYPE_DECL
1322 && TREE_CODE (decl
) != LABEL_DECL
);
1324 /* For a duplicate declaration, we can be called twice on the
1325 same DECL node. Don't discard the RTL already made. */
1326 if (DECL_RTL_SET_P (decl
))
1328 /* If the old RTL had the wrong mode, fix the mode. */
1329 x
= DECL_RTL (decl
);
1330 if (GET_MODE (x
) != DECL_MODE (decl
))
1331 SET_DECL_RTL (decl
, adjust_address_nv (x
, DECL_MODE (decl
), 0));
1333 if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1336 /* ??? Another way to do this would be to maintain a hashed
1337 table of such critters. Instead of adding stuff to a DECL
1338 to give certain attributes to it, we could use an external
1339 hash map from DECL to set of attributes. */
1341 /* Let the target reassign the RTL if it wants.
1342 This is necessary, for example, when one machine specific
1343 decl attribute overrides another. */
1344 targetm
.encode_section_info (decl
, DECL_RTL (decl
), false);
1346 /* If the symbol has a SYMBOL_REF_BLOCK field, update it based
1347 on the new decl information. */
1349 && GET_CODE (XEXP (x
, 0)) == SYMBOL_REF
1350 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (x
, 0)))
1351 change_symbol_block (XEXP (x
, 0), get_block_for_decl (decl
));
1356 /* If this variable belongs to the global constant pool, retrieve the
1357 pre-computed RTL or recompute it in LTO mode. */
1358 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_IN_CONSTANT_POOL (decl
))
1360 SET_DECL_RTL (decl
, output_constant_def (DECL_INITIAL (decl
), 1));
1364 id
= DECL_ASSEMBLER_NAME (decl
);
1365 if (TREE_CODE (decl
) == FUNCTION_DECL
1366 && cgraph_node::get (decl
)
1367 && cgraph_node::get (decl
)->instrumentation_clone
)
1368 ultimate_transparent_alias_target (&id
);
1369 name
= IDENTIFIER_POINTER (id
);
1371 if (name
[0] != '*' && TREE_CODE (decl
) != FUNCTION_DECL
1372 && DECL_REGISTER (decl
))
1374 error ("register name not specified for %q+D", decl
);
1376 else if (TREE_CODE (decl
) != FUNCTION_DECL
&& DECL_REGISTER (decl
))
1378 const char *asmspec
= name
+1;
1379 machine_mode mode
= DECL_MODE (decl
);
1380 reg_number
= decode_reg_name (asmspec
);
1381 /* First detect errors in declaring global registers. */
1382 if (reg_number
== -1)
1383 error ("register name not specified for %q+D", decl
);
1384 else if (reg_number
< 0)
1385 error ("invalid register name for %q+D", decl
);
1386 else if (mode
== BLKmode
)
1387 error ("data type of %q+D isn%'t suitable for a register",
1389 else if (!in_hard_reg_set_p (accessible_reg_set
, mode
, reg_number
))
1390 error ("the register specified for %q+D cannot be accessed"
1391 " by the current target", decl
);
1392 else if (!in_hard_reg_set_p (operand_reg_set
, mode
, reg_number
))
1393 error ("the register specified for %q+D is not general enough"
1394 " to be used as a register variable", decl
);
1395 else if (!HARD_REGNO_MODE_OK (reg_number
, mode
))
1396 error ("register specified for %q+D isn%'t suitable for data type",
1398 /* Now handle properly declared static register variables. */
1403 if (DECL_INITIAL (decl
) != 0 && TREE_STATIC (decl
))
1405 DECL_INITIAL (decl
) = 0;
1406 error ("global register variable has initial value");
1408 if (TREE_THIS_VOLATILE (decl
))
1409 warning (OPT_Wvolatile_register_var
,
1410 "optimization may eliminate reads and/or "
1411 "writes to register variables");
1413 /* If the user specified one of the eliminables registers here,
1414 e.g., FRAME_POINTER_REGNUM, we don't want to get this variable
1415 confused with that register and be eliminated. This usage is
1416 somewhat suspect... */
1418 SET_DECL_RTL (decl
, gen_raw_REG (mode
, reg_number
));
1419 ORIGINAL_REGNO (DECL_RTL (decl
)) = reg_number
;
1420 REG_USERVAR_P (DECL_RTL (decl
)) = 1;
1422 if (TREE_STATIC (decl
))
1424 /* Make this register global, so not usable for anything
1426 #ifdef ASM_DECLARE_REGISTER_GLOBAL
1427 name
= IDENTIFIER_POINTER (DECL_NAME (decl
));
1428 ASM_DECLARE_REGISTER_GLOBAL (asm_out_file
, decl
, reg_number
, name
);
1430 nregs
= hard_regno_nregs
[reg_number
][mode
];
1432 globalize_reg (decl
, reg_number
+ --nregs
);
1435 /* As a register variable, it has no section. */
1438 /* Avoid internal errors from invalid register
1440 SET_DECL_ASSEMBLER_NAME (decl
, NULL_TREE
);
1441 DECL_HARD_REGISTER (decl
) = 0;
1444 /* Now handle ordinary static variables and functions (in memory).
1445 Also handle vars declared register invalidly. */
1446 else if (name
[0] == '*')
1448 #ifdef REGISTER_PREFIX
1449 if (strlen (REGISTER_PREFIX
) != 0)
1451 reg_number
= decode_reg_name (name
);
1452 if (reg_number
>= 0 || reg_number
== -3)
1453 error ("register name given for non-register variable %q+D", decl
);
1458 /* Specifying a section attribute on a variable forces it into a
1459 non-.bss section, and thus it cannot be common. */
1460 /* FIXME: In general this code should not be necessary because
1461 visibility pass is doing the same work. But notice_global_symbol
1462 is called early and it needs to make DECL_RTL to get the name.
1463 we take care of recomputing the DECL_RTL after visibility is changed. */
1464 if (TREE_CODE (decl
) == VAR_DECL
1465 && (TREE_STATIC (decl
) || DECL_EXTERNAL (decl
))
1466 && DECL_SECTION_NAME (decl
) != NULL
1467 && DECL_INITIAL (decl
) == NULL_TREE
1468 && DECL_COMMON (decl
))
1469 DECL_COMMON (decl
) = 0;
1471 /* Variables can't be both common and weak. */
1472 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_WEAK (decl
))
1473 DECL_COMMON (decl
) = 0;
1475 if (use_object_blocks_p () && use_blocks_for_decl_p (decl
))
1476 x
= create_block_symbol (name
, get_block_for_decl (decl
), -1);
1479 machine_mode address_mode
= Pmode
;
1480 if (TREE_TYPE (decl
) != error_mark_node
)
1482 addr_space_t as
= TYPE_ADDR_SPACE (TREE_TYPE (decl
));
1483 address_mode
= targetm
.addr_space
.address_mode (as
);
1485 x
= gen_rtx_SYMBOL_REF (address_mode
, name
);
1487 SYMBOL_REF_WEAK (x
) = DECL_WEAK (decl
);
1488 SET_SYMBOL_REF_DECL (x
, decl
);
1490 x
= gen_rtx_MEM (DECL_MODE (decl
), x
);
1491 if (TREE_CODE (decl
) != FUNCTION_DECL
)
1492 set_mem_attributes (x
, decl
, 1);
1493 SET_DECL_RTL (decl
, x
);
1495 /* Optionally set flags or add text to the name to record information
1496 such as that it is a function name.
1497 If the name is changed, the macro ASM_OUTPUT_LABELREF
1498 will have to know how to strip this information. */
1499 targetm
.encode_section_info (decl
, DECL_RTL (decl
), true);
1502 /* Like make_decl_rtl, but inhibit creation of new alias sets when
1503 calling make_decl_rtl. Also, reset DECL_RTL before returning the
1507 make_decl_rtl_for_debug (tree decl
)
1509 unsigned int save_aliasing_flag
;
1512 if (DECL_RTL_SET_P (decl
))
1513 return DECL_RTL (decl
);
1515 /* Kludge alert! Somewhere down the call chain, make_decl_rtl will
1516 call new_alias_set. If running with -fcompare-debug, sometimes
1517 we do not want to create alias sets that will throw the alias
1518 numbers off in the comparison dumps. So... clearing
1519 flag_strict_aliasing will keep new_alias_set() from creating a
1521 save_aliasing_flag
= flag_strict_aliasing
;
1522 flag_strict_aliasing
= 0;
1524 rtl
= DECL_RTL (decl
);
1525 /* Reset DECL_RTL back, as various parts of the compiler expects
1526 DECL_RTL set meaning it is actually going to be output. */
1527 SET_DECL_RTL (decl
, NULL
);
1529 flag_strict_aliasing
= save_aliasing_flag
;
1533 /* Output a string of literal assembler code
1534 for an `asm' keyword used between functions. */
1537 assemble_asm (tree string
)
1542 if (TREE_CODE (string
) == ADDR_EXPR
)
1543 string
= TREE_OPERAND (string
, 0);
1545 p
= TREE_STRING_POINTER (string
);
1546 fprintf (asm_out_file
, "%s%s\n", p
[0] == '\t' ? "" : "\t", p
);
1549 /* Write the address of the entity given by SYMBOL to SEC. */
1551 assemble_addr_to_section (rtx symbol
, section
*sec
)
1553 switch_to_section (sec
);
1554 assemble_align (POINTER_SIZE
);
1555 assemble_integer (symbol
, POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
1558 /* Return the numbered .ctors.N (if CONSTRUCTOR_P) or .dtors.N (if
1559 not) section for PRIORITY. */
1561 get_cdtor_priority_section (int priority
, bool constructor_p
)
1565 /* ??? This only works reliably with the GNU linker. */
1566 sprintf (buf
, "%s.%.5u",
1567 constructor_p
? ".ctors" : ".dtors",
1568 /* Invert the numbering so the linker puts us in the proper
1569 order; constructors are run from right to left, and the
1570 linker sorts in increasing order. */
1571 MAX_INIT_PRIORITY
- priority
);
1572 return get_section (buf
, SECTION_WRITE
, NULL
);
1576 default_named_section_asm_out_destructor (rtx symbol
, int priority
)
1580 if (priority
!= DEFAULT_INIT_PRIORITY
)
1581 sec
= get_cdtor_priority_section (priority
,
1582 /*constructor_p=*/false);
1584 sec
= get_section (".dtors", SECTION_WRITE
, NULL
);
1586 assemble_addr_to_section (symbol
, sec
);
1589 #ifdef DTORS_SECTION_ASM_OP
1591 default_dtor_section_asm_out_destructor (rtx symbol
,
1592 int priority ATTRIBUTE_UNUSED
)
1594 assemble_addr_to_section (symbol
, dtors_section
);
1599 default_named_section_asm_out_constructor (rtx symbol
, int priority
)
1603 if (priority
!= DEFAULT_INIT_PRIORITY
)
1604 sec
= get_cdtor_priority_section (priority
,
1605 /*constructor_p=*/true);
1607 sec
= get_section (".ctors", SECTION_WRITE
, NULL
);
1609 assemble_addr_to_section (symbol
, sec
);
1612 #ifdef CTORS_SECTION_ASM_OP
1614 default_ctor_section_asm_out_constructor (rtx symbol
,
1615 int priority ATTRIBUTE_UNUSED
)
1617 assemble_addr_to_section (symbol
, ctors_section
);
1621 /* CONSTANT_POOL_BEFORE_FUNCTION may be defined as an expression with
1622 a nonzero value if the constant pool should be output before the
1623 start of the function, or a zero value if the pool should output
1624 after the end of the function. The default is to put it before the
1627 #ifndef CONSTANT_POOL_BEFORE_FUNCTION
1628 #define CONSTANT_POOL_BEFORE_FUNCTION 1
1631 /* DECL is an object (either VAR_DECL or FUNCTION_DECL) which is going
1632 to be output to assembler.
1633 Set first_global_object_name and weak_global_object_name as appropriate. */
1636 notice_global_symbol (tree decl
)
1638 const char **t
= &first_global_object_name
;
1640 if (first_global_object_name
1641 || !TREE_PUBLIC (decl
)
1642 || DECL_EXTERNAL (decl
)
1643 || !DECL_NAME (decl
)
1644 || (TREE_CODE (decl
) == VAR_DECL
&& DECL_HARD_REGISTER (decl
))
1645 || (TREE_CODE (decl
) != FUNCTION_DECL
1646 && (TREE_CODE (decl
) != VAR_DECL
1647 || (DECL_COMMON (decl
)
1648 && (DECL_INITIAL (decl
) == 0
1649 || DECL_INITIAL (decl
) == error_mark_node
)))))
1652 /* We win when global object is found, but it is useful to know about weak
1653 symbol as well so we can produce nicer unique names. */
1654 if (DECL_WEAK (decl
) || DECL_ONE_ONLY (decl
) || flag_shlib
)
1655 t
= &weak_global_object_name
;
1659 tree id
= DECL_ASSEMBLER_NAME (decl
);
1660 ultimate_transparent_alias_target (&id
);
1661 *t
= ggc_strdup (targetm
.strip_name_encoding (IDENTIFIER_POINTER (id
)));
1665 /* If not using flag_reorder_blocks_and_partition, decide early whether the
1666 current function goes into the cold section, so that targets can use
1667 current_function_section during RTL expansion. DECL describes the
1671 decide_function_section (tree decl
)
1673 first_function_block_is_cold
= false;
1675 if (flag_reorder_blocks_and_partition
)
1676 /* We will decide in assemble_start_function. */
1679 if (DECL_SECTION_NAME (decl
))
1681 struct cgraph_node
*node
= cgraph_node::get (current_function_decl
);
1682 /* Calls to function_section rely on first_function_block_is_cold
1684 first_function_block_is_cold
= (node
1686 == NODE_FREQUENCY_UNLIKELY_EXECUTED
);
1689 in_cold_section_p
= first_function_block_is_cold
;
1692 /* Get the function's name, as described by its RTL. This may be
1693 different from the DECL_NAME name used in the source file. */
1695 get_fnname_from_decl (tree decl
)
1697 rtx x
= DECL_RTL (decl
);
1698 gcc_assert (MEM_P (x
));
1700 gcc_assert (GET_CODE (x
) == SYMBOL_REF
);
1704 /* Output assembler code for the constant pool of a function and associated
1705 with defining the name of the function. DECL describes the function.
1706 NAME is the function's name. For the constant pool, we use the current
1707 constant pool data. */
1710 assemble_start_function (tree decl
, const char *fnname
)
1713 char tmp_label
[100];
1714 bool hot_label_written
= false;
1716 if (flag_reorder_blocks_and_partition
)
1718 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTB", const_labelno
);
1719 crtl
->subsections
.hot_section_label
= ggc_strdup (tmp_label
);
1720 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDB", const_labelno
);
1721 crtl
->subsections
.cold_section_label
= ggc_strdup (tmp_label
);
1722 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LHOTE", const_labelno
);
1723 crtl
->subsections
.hot_section_end_label
= ggc_strdup (tmp_label
);
1724 ASM_GENERATE_INTERNAL_LABEL (tmp_label
, "LCOLDE", const_labelno
);
1725 crtl
->subsections
.cold_section_end_label
= ggc_strdup (tmp_label
);
1727 cold_function_name
= NULL_TREE
;
1731 crtl
->subsections
.hot_section_label
= NULL
;
1732 crtl
->subsections
.cold_section_label
= NULL
;
1733 crtl
->subsections
.hot_section_end_label
= NULL
;
1734 crtl
->subsections
.cold_section_end_label
= NULL
;
1737 /* The following code does not need preprocessing in the assembler. */
1741 if (CONSTANT_POOL_BEFORE_FUNCTION
)
1742 output_constant_pool (fnname
, decl
);
1744 align
= symtab_node::get (decl
)->definition_alignment ();
1746 /* Make sure the not and cold text (code) sections are properly
1747 aligned. This is necessary here in the case where the function
1748 has both hot and cold sections, because we don't want to re-set
1749 the alignment when the section switch happens mid-function. */
1751 if (flag_reorder_blocks_and_partition
)
1753 first_function_block_is_cold
= false;
1755 switch_to_section (unlikely_text_section ());
1756 assemble_align (align
);
1757 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_label
);
1759 /* When the function starts with a cold section, we need to explicitly
1760 align the hot section and write out the hot section label.
1761 But if the current function is a thunk, we do not have a CFG. */
1763 && BB_PARTITION (ENTRY_BLOCK_PTR_FOR_FN (cfun
)->next_bb
) == BB_COLD_PARTITION
)
1765 switch_to_section (text_section
);
1766 assemble_align (align
);
1767 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1768 hot_label_written
= true;
1769 first_function_block_is_cold
= true;
1771 in_cold_section_p
= first_function_block_is_cold
;
1775 /* Switch to the correct text section for the start of the function. */
1777 switch_to_section (function_section (decl
));
1778 if (flag_reorder_blocks_and_partition
1779 && !hot_label_written
)
1780 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_label
);
1782 /* Tell assembler to move to target machine's alignment for functions. */
1783 align
= floor_log2 (align
/ BITS_PER_UNIT
);
1786 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
1789 /* Handle a user-specified function alignment.
1790 Note that we still need to align to DECL_ALIGN, as above,
1791 because ASM_OUTPUT_MAX_SKIP_ALIGN might not do any alignment at all. */
1792 if (! DECL_USER_ALIGN (decl
)
1793 && align_functions_log
> align
1794 && optimize_function_for_speed_p (cfun
))
1796 #ifdef ASM_OUTPUT_MAX_SKIP_ALIGN
1797 ASM_OUTPUT_MAX_SKIP_ALIGN (asm_out_file
,
1798 align_functions_log
, align_functions
- 1);
1800 ASM_OUTPUT_ALIGN (asm_out_file
, align_functions_log
);
1804 #ifdef ASM_OUTPUT_FUNCTION_PREFIX
1805 ASM_OUTPUT_FUNCTION_PREFIX (asm_out_file
, fnname
);
1808 if (!DECL_IGNORED_P (decl
))
1809 (*debug_hooks
->begin_function
) (decl
);
1811 /* Make function name accessible from other files, if appropriate. */
1813 if (TREE_PUBLIC (decl
)
1814 || (cgraph_node::get (decl
)->instrumentation_clone
1815 && cgraph_node::get (decl
)->instrumented_version
1816 && TREE_PUBLIC (cgraph_node::get (decl
)->instrumented_version
->decl
)))
1818 notice_global_symbol (decl
);
1820 globalize_decl (decl
);
1822 maybe_assemble_visibility (decl
);
1825 if (DECL_PRESERVE_P (decl
))
1826 targetm
.asm_out
.mark_decl_preserved (fnname
);
1828 /* Do any machine/system dependent processing of the function name. */
1829 #ifdef ASM_DECLARE_FUNCTION_NAME
1830 ASM_DECLARE_FUNCTION_NAME (asm_out_file
, fnname
, current_function_decl
);
1832 /* Standard thing is just output label for the function. */
1833 ASM_OUTPUT_FUNCTION_LABEL (asm_out_file
, fnname
, current_function_decl
);
1834 #endif /* ASM_DECLARE_FUNCTION_NAME */
1836 if (lookup_attribute ("no_split_stack", DECL_ATTRIBUTES (decl
)))
1837 saw_no_split_stack
= true;
1840 /* Output assembler code associated with defining the size of the
1841 function. DECL describes the function. NAME is the function's name. */
1844 assemble_end_function (tree decl
, const char *fnname ATTRIBUTE_UNUSED
)
1846 #ifdef ASM_DECLARE_FUNCTION_SIZE
1847 /* We could have switched section in the middle of the function. */
1848 if (flag_reorder_blocks_and_partition
)
1849 switch_to_section (function_section (decl
));
1850 ASM_DECLARE_FUNCTION_SIZE (asm_out_file
, fnname
, decl
);
1852 if (! CONSTANT_POOL_BEFORE_FUNCTION
)
1854 output_constant_pool (fnname
, decl
);
1855 switch_to_section (function_section (decl
)); /* need to switch back */
1857 /* Output labels for end of hot/cold text sections (to be used by
1859 if (flag_reorder_blocks_and_partition
)
1861 section
*save_text_section
;
1863 save_text_section
= in_section
;
1864 switch_to_section (unlikely_text_section ());
1865 #ifdef ASM_DECLARE_COLD_FUNCTION_SIZE
1866 if (cold_function_name
!= NULL_TREE
)
1867 ASM_DECLARE_COLD_FUNCTION_SIZE (asm_out_file
,
1868 IDENTIFIER_POINTER (cold_function_name
),
1871 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.cold_section_end_label
);
1872 if (first_function_block_is_cold
)
1873 switch_to_section (text_section
);
1875 switch_to_section (function_section (decl
));
1876 ASM_OUTPUT_LABEL (asm_out_file
, crtl
->subsections
.hot_section_end_label
);
1877 switch_to_section (save_text_section
);
1881 /* Assemble code to leave SIZE bytes of zeros. */
1884 assemble_zeros (unsigned HOST_WIDE_INT size
)
1886 /* Do no output if -fsyntax-only. */
1887 if (flag_syntax_only
)
1890 #ifdef ASM_NO_SKIP_IN_TEXT
1891 /* The `space' pseudo in the text section outputs nop insns rather than 0s,
1892 so we must output 0s explicitly in the text section. */
1893 if (ASM_NO_SKIP_IN_TEXT
&& (in_section
->common
.flags
& SECTION_CODE
) != 0)
1895 unsigned HOST_WIDE_INT i
;
1896 for (i
= 0; i
< size
; i
++)
1897 assemble_integer (const0_rtx
, 1, BITS_PER_UNIT
, 1);
1902 ASM_OUTPUT_SKIP (asm_out_file
, size
);
1905 /* Assemble an alignment pseudo op for an ALIGN-bit boundary. */
1908 assemble_align (int align
)
1910 if (align
> BITS_PER_UNIT
)
1912 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
1916 /* Assemble a string constant with the specified C string as contents. */
1919 assemble_string (const char *p
, int size
)
1924 /* If the string is very long, split it up. */
1928 int thissize
= size
- pos
;
1929 if (thissize
> maximum
)
1932 ASM_OUTPUT_ASCII (asm_out_file
, p
, thissize
);
1940 /* A noswitch_section_callback for lcomm_section. */
1943 emit_local (tree decl ATTRIBUTE_UNUSED
,
1944 const char *name ATTRIBUTE_UNUSED
,
1945 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1946 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1948 #if defined ASM_OUTPUT_ALIGNED_DECL_LOCAL
1949 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
1950 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, decl
, name
,
1953 #elif defined ASM_OUTPUT_ALIGNED_LOCAL
1954 unsigned int align
= symtab_node::get (decl
)->definition_alignment ();
1955 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, align
);
1958 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
1963 /* A noswitch_section_callback for bss_noswitch_section. */
1965 #if defined ASM_OUTPUT_ALIGNED_BSS
1967 emit_bss (tree decl ATTRIBUTE_UNUSED
,
1968 const char *name ATTRIBUTE_UNUSED
,
1969 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1970 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1972 ASM_OUTPUT_ALIGNED_BSS (asm_out_file
, decl
, name
, size
,
1973 get_variable_align (decl
));
1978 /* A noswitch_section_callback for comm_section. */
1981 emit_common (tree decl ATTRIBUTE_UNUSED
,
1982 const char *name ATTRIBUTE_UNUSED
,
1983 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
1984 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
1986 #if defined ASM_OUTPUT_ALIGNED_DECL_COMMON
1987 ASM_OUTPUT_ALIGNED_DECL_COMMON (asm_out_file
, decl
, name
,
1988 size
, get_variable_align (decl
));
1990 #elif defined ASM_OUTPUT_ALIGNED_COMMON
1991 ASM_OUTPUT_ALIGNED_COMMON (asm_out_file
, name
, size
,
1992 get_variable_align (decl
));
1995 ASM_OUTPUT_COMMON (asm_out_file
, name
, size
, rounded
);
2000 /* A noswitch_section_callback for tls_comm_section. */
2003 emit_tls_common (tree decl ATTRIBUTE_UNUSED
,
2004 const char *name ATTRIBUTE_UNUSED
,
2005 unsigned HOST_WIDE_INT size ATTRIBUTE_UNUSED
,
2006 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
)
2008 #ifdef ASM_OUTPUT_TLS_COMMON
2009 ASM_OUTPUT_TLS_COMMON (asm_out_file
, decl
, name
, size
);
2012 sorry ("thread-local COMMON data not implemented");
2017 /* Assemble DECL given that it belongs in SECTION_NOSWITCH section SECT.
2018 NAME is the name of DECL's SYMBOL_REF. */
2021 assemble_noswitch_variable (tree decl
, const char *name
, section
*sect
,
2024 unsigned HOST_WIDE_INT size
, rounded
;
2026 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2029 if ((flag_sanitize
& SANITIZE_ADDRESS
) && asan_protect_global (decl
))
2030 size
+= asan_red_zone_size (size
);
2032 /* Don't allocate zero bytes of common,
2033 since that means "undefined external" in the linker. */
2037 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2038 so that each uninitialized object starts on such a boundary. */
2039 rounded
+= (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1;
2040 rounded
= (rounded
/ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2041 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2043 if (!sect
->noswitch
.callback (decl
, name
, size
, rounded
)
2044 && (unsigned HOST_WIDE_INT
) (align
/ BITS_PER_UNIT
) > rounded
)
2045 error ("requested alignment for %q+D is greater than "
2046 "implemented alignment of %wu", decl
, rounded
);
2049 /* A subroutine of assemble_variable. Output the label and contents of
2050 DECL, whose address is a SYMBOL_REF with name NAME. DONT_OUTPUT_DATA
2051 is as for assemble_variable. */
2054 assemble_variable_contents (tree decl
, const char *name
,
2055 bool dont_output_data
)
2057 /* Do any machine/system dependent processing of the object. */
2058 #ifdef ASM_DECLARE_OBJECT_NAME
2059 last_assemble_variable_decl
= decl
;
2060 ASM_DECLARE_OBJECT_NAME (asm_out_file
, name
, decl
);
2062 /* Standard thing is just output label for the object. */
2063 ASM_OUTPUT_LABEL (asm_out_file
, name
);
2064 #endif /* ASM_DECLARE_OBJECT_NAME */
2066 if (!dont_output_data
)
2068 /* Caller is supposed to use varpool_get_constructor when it wants
2069 to output the body. */
2070 gcc_assert (!in_lto_p
|| DECL_INITIAL (decl
) != error_mark_node
);
2071 if (DECL_INITIAL (decl
)
2072 && DECL_INITIAL (decl
) != error_mark_node
2073 && !initializer_zerop (DECL_INITIAL (decl
)))
2074 /* Output the actual data. */
2075 output_constant (DECL_INITIAL (decl
),
2076 tree_to_uhwi (DECL_SIZE_UNIT (decl
)),
2077 get_variable_align (decl
));
2079 /* Leave space for it. */
2080 assemble_zeros (tree_to_uhwi (DECL_SIZE_UNIT (decl
)));
2081 targetm
.asm_out
.decl_end ();
2085 /* Write out assembly for the variable DECL, which is not defined in
2086 the current translation unit. */
2088 assemble_undefined_decl (tree decl
)
2090 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
2091 targetm
.asm_out
.assemble_undefined_decl (asm_out_file
, name
, decl
);
2094 /* Assemble everything that is needed for a variable or function declaration.
2095 Not used for automatic variables, and not used for function definitions.
2096 Should not be called for variables of incomplete structure type.
2098 TOP_LEVEL is nonzero if this variable has file scope.
2099 AT_END is nonzero if this is the special handling, at end of compilation,
2100 to define things that have had only tentative definitions.
2101 DONT_OUTPUT_DATA if nonzero means don't actually output the
2102 initial value (that will be done by the caller). */
2105 assemble_variable (tree decl
, int top_level ATTRIBUTE_UNUSED
,
2106 int at_end ATTRIBUTE_UNUSED
, int dont_output_data
)
2109 rtx decl_rtl
, symbol
;
2112 bool asan_protected
= false;
2114 /* This function is supposed to handle VARIABLES. Ensure we have one. */
2115 gcc_assert (TREE_CODE (decl
) == VAR_DECL
);
2117 /* Emulated TLS had better not get this far. */
2118 gcc_checking_assert (targetm
.have_tls
|| !DECL_THREAD_LOCAL_P (decl
));
2120 last_assemble_variable_decl
= 0;
2122 /* Normally no need to say anything here for external references,
2123 since assemble_external is called by the language-specific code
2124 when a declaration is first seen. */
2126 if (DECL_EXTERNAL (decl
))
2129 /* Do nothing for global register variables. */
2130 if (DECL_RTL_SET_P (decl
) && REG_P (DECL_RTL (decl
)))
2132 TREE_ASM_WRITTEN (decl
) = 1;
2136 /* If type was incomplete when the variable was declared,
2137 see if it is complete now. */
2139 if (DECL_SIZE (decl
) == 0)
2140 layout_decl (decl
, 0);
2142 /* Still incomplete => don't allocate it; treat the tentative defn
2143 (which is what it must have been) as an `extern' reference. */
2145 if (!dont_output_data
&& DECL_SIZE (decl
) == 0)
2147 error ("storage size of %q+D isn%'t known", decl
);
2148 TREE_ASM_WRITTEN (decl
) = 1;
2152 /* The first declaration of a variable that comes through this function
2153 decides whether it is global (in C, has external linkage)
2154 or local (in C, has internal linkage). So do nothing more
2155 if this function has already run. */
2157 if (TREE_ASM_WRITTEN (decl
))
2160 /* Make sure targetm.encode_section_info is invoked before we set
2162 decl_rtl
= DECL_RTL (decl
);
2164 TREE_ASM_WRITTEN (decl
) = 1;
2166 /* Do no output if -fsyntax-only. */
2167 if (flag_syntax_only
)
2170 if (! dont_output_data
2171 && ! valid_constant_size_p (DECL_SIZE_UNIT (decl
)))
2173 error ("size of variable %q+D is too large", decl
);
2177 gcc_assert (MEM_P (decl_rtl
));
2178 gcc_assert (GET_CODE (XEXP (decl_rtl
, 0)) == SYMBOL_REF
);
2179 symbol
= XEXP (decl_rtl
, 0);
2181 /* If this symbol belongs to the tree constant pool, output the constant
2182 if it hasn't already been written. */
2183 if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
2185 tree decl
= SYMBOL_REF_DECL (symbol
);
2186 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
2187 output_constant_def_contents (symbol
);
2193 name
= XSTR (symbol
, 0);
2194 if (TREE_PUBLIC (decl
) && DECL_NAME (decl
))
2195 notice_global_symbol (decl
);
2197 /* Compute the alignment of this data. */
2199 align_variable (decl
, dont_output_data
);
2201 if ((flag_sanitize
& SANITIZE_ADDRESS
)
2202 && asan_protect_global (decl
))
2204 asan_protected
= true;
2205 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
2206 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
2209 set_mem_align (decl_rtl
, DECL_ALIGN (decl
));
2211 align
= get_variable_align (decl
);
2213 if (TREE_PUBLIC (decl
))
2214 maybe_assemble_visibility (decl
);
2216 if (DECL_PRESERVE_P (decl
))
2217 targetm
.asm_out
.mark_decl_preserved (name
);
2219 /* First make the assembler name(s) global if appropriate. */
2220 sect
= get_variable_section (decl
, false);
2221 if (TREE_PUBLIC (decl
)
2222 && (sect
->common
.flags
& SECTION_COMMON
) == 0)
2223 globalize_decl (decl
);
2225 /* Output any data that we will need to use the address of. */
2226 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
2227 output_addressed_constants (DECL_INITIAL (decl
));
2229 /* dbxout.c needs to know this. */
2230 if (sect
&& (sect
->common
.flags
& SECTION_CODE
) != 0)
2231 DECL_IN_TEXT_SECTION (decl
) = 1;
2233 /* If the decl is part of an object_block, make sure that the decl
2234 has been positioned within its block, but do not write out its
2235 definition yet. output_object_blocks will do that later. */
2236 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
2238 gcc_assert (!dont_output_data
);
2239 place_block_symbol (symbol
);
2241 else if (SECTION_STYLE (sect
) == SECTION_NOSWITCH
)
2242 assemble_noswitch_variable (decl
, name
, sect
, align
);
2245 /* The following bit of code ensures that vtable_map
2246 variables are not only in the comdat section, but that
2247 each variable has its own unique comdat name. If this
2248 code is removed, the variables end up in the same section
2249 with a single comdat name.
2251 FIXME: resolve_unique_section needs to deal better with
2252 decls with both DECL_SECTION_NAME and DECL_ONE_ONLY. Once
2253 that is fixed, this if-else statement can be replaced with
2254 a single call to "switch_to_section (sect)". */
2255 if (sect
->named
.name
2256 && (strcmp (sect
->named
.name
, ".vtable_map_vars") == 0))
2258 #if defined (OBJECT_FORMAT_ELF)
2259 targetm
.asm_out
.named_section (sect
->named
.name
,
2260 sect
->named
.common
.flags
2264 #elif defined (TARGET_PECOFF)
2265 /* Neither OBJECT_FORMAT_PE, nor OBJECT_FORMAT_COFF is set here.
2266 Therefore the following check is used.
2267 In case a the target is PE or COFF a comdat group section
2268 is created, e.g. .vtable_map_vars$foo. The linker places
2269 everything in .vtable_map_vars at the end.
2271 A fix could be made in
2272 gcc/config/i386/winnt.c: i386_pe_unique_section. */
2277 if (TREE_CODE (DECL_NAME (decl
)) == IDENTIFIER_NODE
)
2278 name
= ACONCAT ((sect
->named
.name
, "$",
2279 IDENTIFIER_POINTER (DECL_NAME (decl
)), NULL
));
2281 name
= ACONCAT ((sect
->named
.name
, "$",
2282 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (DECL_NAME (decl
))),
2285 targetm
.asm_out
.named_section (name
,
2286 sect
->named
.common
.flags
2292 switch_to_section (sect
);
2296 switch_to_section (sect
);
2297 if (align
> BITS_PER_UNIT
)
2298 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
2299 assemble_variable_contents (decl
, name
, dont_output_data
);
2302 unsigned HOST_WIDE_INT
int size
2303 = tree_to_uhwi (DECL_SIZE_UNIT (decl
));
2304 assemble_zeros (asan_red_zone_size (size
));
2310 /* Given a function declaration (FN_DECL), this function assembles the
2311 function into the .preinit_array section. */
2314 assemble_vtv_preinit_initializer (tree fn_decl
)
2317 unsigned flags
= SECTION_WRITE
;
2318 rtx symbol
= XEXP (DECL_RTL (fn_decl
), 0);
2320 flags
|= SECTION_NOTYPE
;
2321 sect
= get_section (".preinit_array", flags
, fn_decl
);
2322 switch_to_section (sect
);
2323 assemble_addr_to_section (symbol
, sect
);
2326 /* Return 1 if type TYPE contains any pointers. */
2329 contains_pointers_p (tree type
)
2331 switch (TREE_CODE (type
))
2334 case REFERENCE_TYPE
:
2335 /* I'm not sure whether OFFSET_TYPE needs this treatment,
2336 so I'll play safe and return 1. */
2342 case QUAL_UNION_TYPE
:
2345 /* For a type that has fields, see if the fields have pointers. */
2346 for (fields
= TYPE_FIELDS (type
); fields
; fields
= DECL_CHAIN (fields
))
2347 if (TREE_CODE (fields
) == FIELD_DECL
2348 && contains_pointers_p (TREE_TYPE (fields
)))
2354 /* An array type contains pointers if its element type does. */
2355 return contains_pointers_p (TREE_TYPE (type
));
2362 /* We delay assemble_external processing until
2363 the compilation unit is finalized. This is the best we can do for
2364 right now (i.e. stage 3 of GCC 4.0) - the right thing is to delay
2365 it all the way to final. See PR 17982 for further discussion. */
2366 static GTY(()) tree pending_assemble_externals
;
2368 #ifdef ASM_OUTPUT_EXTERNAL
2369 /* Some targets delay some output to final using TARGET_ASM_FILE_END.
2370 As a result, assemble_external can be called after the list of externals
2371 is processed and the pointer set destroyed. */
2372 static bool pending_assemble_externals_processed
;
2374 /* Avoid O(external_decls**2) lookups in the pending_assemble_externals
2375 TREE_LIST in assemble_external. */
2376 static hash_set
<tree
> *pending_assemble_externals_set
;
2378 /* True if DECL is a function decl for which no out-of-line copy exists.
2379 It is assumed that DECL's assembler name has been set. */
2382 incorporeal_function_p (tree decl
)
2384 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
2388 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
2389 && (DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA
2390 || DECL_FUNCTION_CODE (decl
) == BUILT_IN_ALLOCA_WITH_ALIGN
))
2393 name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
2394 /* Atomic or sync builtins which have survived this far will be
2395 resolved externally and therefore are not incorporeal. */
2396 if (strncmp (name
, "__builtin_", 10) == 0)
2402 /* Actually do the tests to determine if this is necessary, and invoke
2403 ASM_OUTPUT_EXTERNAL. */
2405 assemble_external_real (tree decl
)
2407 rtx rtl
= DECL_RTL (decl
);
2409 if (MEM_P (rtl
) && GET_CODE (XEXP (rtl
, 0)) == SYMBOL_REF
2410 && !SYMBOL_REF_USED (XEXP (rtl
, 0))
2411 && !incorporeal_function_p (decl
))
2413 /* Some systems do require some output. */
2414 SYMBOL_REF_USED (XEXP (rtl
, 0)) = 1;
2415 ASM_OUTPUT_EXTERNAL (asm_out_file
, decl
, XSTR (XEXP (rtl
, 0), 0));
2421 process_pending_assemble_externals (void)
2423 #ifdef ASM_OUTPUT_EXTERNAL
2425 for (list
= pending_assemble_externals
; list
; list
= TREE_CHAIN (list
))
2426 assemble_external_real (TREE_VALUE (list
));
2428 pending_assemble_externals
= 0;
2429 pending_assemble_externals_processed
= true;
2430 delete pending_assemble_externals_set
;
2434 /* This TREE_LIST contains any weak symbol declarations waiting
2436 static GTY(()) tree weak_decls
;
2438 /* Output something to declare an external symbol to the assembler,
2439 and qualifiers such as weakness. (Most assemblers don't need
2440 extern declaration, so we normally output nothing.) Do nothing if
2441 DECL is not external. */
2444 assemble_external (tree decl ATTRIBUTE_UNUSED
)
2446 /* Make sure that the ASM_OUT_FILE is open.
2447 If it's not, we should not be calling this function. */
2448 gcc_assert (asm_out_file
);
2450 /* In a perfect world, the following condition would be true.
2451 Sadly, the Java and Go front ends emit assembly *from the front end*,
2452 bypassing the call graph. See PR52739. Fix before GCC 4.8. */
2454 /* This function should only be called if we are expanding, or have
2456 Ideally, only final.c would be calling this function, but it is
2457 not clear whether that would break things somehow. See PR 17982
2458 for further discussion. */
2459 gcc_assert (state
== EXPANSION
2460 || state
== FINISHED
);
2463 if (!DECL_P (decl
) || !DECL_EXTERNAL (decl
) || !TREE_PUBLIC (decl
))
2466 /* We want to output annotation for weak and external symbols at
2467 very last to check if they are references or not. */
2469 if (TARGET_SUPPORTS_WEAK
2471 /* TREE_STATIC is a weird and abused creature which is not
2472 generally the right test for whether an entity has been
2473 locally emitted, inlined or otherwise not-really-extern, but
2474 for declarations that can be weak, it happens to be
2476 && !TREE_STATIC (decl
)
2477 && lookup_attribute ("weak", DECL_ATTRIBUTES (decl
))
2478 && value_member (decl
, weak_decls
) == NULL_TREE
)
2479 weak_decls
= tree_cons (NULL
, decl
, weak_decls
);
2481 #ifdef ASM_OUTPUT_EXTERNAL
2482 if (pending_assemble_externals_processed
)
2484 assemble_external_real (decl
);
2488 if (! pending_assemble_externals_set
->add (decl
))
2489 pending_assemble_externals
= tree_cons (NULL
, decl
,
2490 pending_assemble_externals
);
2494 /* Similar, for calling a library function FUN. */
2497 assemble_external_libcall (rtx fun
)
2499 /* Declare library function name external when first used, if nec. */
2500 if (! SYMBOL_REF_USED (fun
))
2502 SYMBOL_REF_USED (fun
) = 1;
2503 targetm
.asm_out
.external_libcall (fun
);
2507 /* Assemble a label named NAME. */
2510 assemble_label (FILE *file
, const char *name
)
2512 ASM_OUTPUT_LABEL (file
, name
);
2515 /* Set the symbol_referenced flag for ID. */
2517 mark_referenced (tree id
)
2519 TREE_SYMBOL_REFERENCED (id
) = 1;
2522 /* Set the symbol_referenced flag for DECL and notify callgraph. */
2524 mark_decl_referenced (tree decl
)
2526 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2528 /* Extern inline functions don't become needed when referenced.
2529 If we know a method will be emitted in other TU and no new
2530 functions can be marked reachable, just use the external
2532 struct cgraph_node
*node
= cgraph_node::get_create (decl
);
2533 if (!DECL_EXTERNAL (decl
)
2534 && !node
->definition
)
2535 node
->mark_force_output ();
2537 else if (TREE_CODE (decl
) == VAR_DECL
)
2539 varpool_node
*node
= varpool_node::get_create (decl
);
2540 /* C++ frontend use mark_decl_references to force COMDAT variables
2541 to be output that might appear dead otherwise. */
2542 node
->force_output
= true;
2544 /* else do nothing - we can get various sorts of CST nodes here,
2545 which do not need to be marked. */
2549 /* Output to FILE (an assembly file) a reference to NAME. If NAME
2550 starts with a *, the rest of NAME is output verbatim. Otherwise
2551 NAME is transformed in a target-specific way (usually by the
2552 addition of an underscore). */
2555 assemble_name_raw (FILE *file
, const char *name
)
2558 fputs (&name
[1], file
);
2560 ASM_OUTPUT_LABELREF (file
, name
);
2563 /* Like assemble_name_raw, but should be used when NAME might refer to
2564 an entity that is also represented as a tree (like a function or
2565 variable). If NAME does refer to such an entity, that entity will
2566 be marked as referenced. */
2569 assemble_name (FILE *file
, const char *name
)
2571 const char *real_name
;
2574 real_name
= targetm
.strip_name_encoding (name
);
2576 id
= maybe_get_identifier (real_name
);
2581 mark_referenced (id
);
2582 ultimate_transparent_alias_target (&id
);
2584 name
= IDENTIFIER_POINTER (id
);
2585 gcc_assert (! TREE_CHAIN (id
));
2588 assemble_name_raw (file
, name
);
2591 /* Allocate SIZE bytes writable static space with a gensym name
2592 and return an RTX to refer to its address. */
2595 assemble_static_space (unsigned HOST_WIDE_INT size
)
2598 const char *namestring
;
2601 ASM_GENERATE_INTERNAL_LABEL (name
, "LF", const_labelno
);
2603 namestring
= ggc_strdup (name
);
2605 x
= gen_rtx_SYMBOL_REF (Pmode
, namestring
);
2606 SYMBOL_REF_FLAGS (x
) = SYMBOL_FLAG_LOCAL
;
2608 #ifdef ASM_OUTPUT_ALIGNED_DECL_LOCAL
2609 ASM_OUTPUT_ALIGNED_DECL_LOCAL (asm_out_file
, NULL_TREE
, name
, size
,
2612 #ifdef ASM_OUTPUT_ALIGNED_LOCAL
2613 ASM_OUTPUT_ALIGNED_LOCAL (asm_out_file
, name
, size
, BIGGEST_ALIGNMENT
);
2616 /* Round size up to multiple of BIGGEST_ALIGNMENT bits
2617 so that each uninitialized object starts on such a boundary. */
2618 /* Variable `rounded' might or might not be used in ASM_OUTPUT_LOCAL. */
2619 unsigned HOST_WIDE_INT rounded ATTRIBUTE_UNUSED
2620 = ((size
+ (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
) - 1)
2621 / (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
)
2622 * (BIGGEST_ALIGNMENT
/ BITS_PER_UNIT
));
2623 ASM_OUTPUT_LOCAL (asm_out_file
, name
, size
, rounded
);
2630 /* Assemble the static constant template for function entry trampolines.
2631 This is done at most once per compilation.
2632 Returns an RTX for the address of the template. */
2634 static GTY(()) rtx initial_trampoline
;
2637 assemble_trampoline_template (void)
2644 gcc_assert (targetm
.asm_out
.trampoline_template
!= NULL
);
2646 if (initial_trampoline
)
2647 return initial_trampoline
;
2649 /* By default, put trampoline templates in read-only data section. */
2651 #ifdef TRAMPOLINE_SECTION
2652 switch_to_section (TRAMPOLINE_SECTION
);
2654 switch_to_section (readonly_data_section
);
2657 /* Write the assembler code to define one. */
2658 align
= floor_log2 (TRAMPOLINE_ALIGNMENT
/ BITS_PER_UNIT
);
2660 ASM_OUTPUT_ALIGN (asm_out_file
, align
);
2662 targetm
.asm_out
.internal_label (asm_out_file
, "LTRAMP", 0);
2663 targetm
.asm_out
.trampoline_template (asm_out_file
);
2665 /* Record the rtl to refer to it. */
2666 ASM_GENERATE_INTERNAL_LABEL (label
, "LTRAMP", 0);
2667 name
= ggc_strdup (label
);
2668 symbol
= gen_rtx_SYMBOL_REF (Pmode
, name
);
2669 SYMBOL_REF_FLAGS (symbol
) = SYMBOL_FLAG_LOCAL
;
2671 initial_trampoline
= gen_const_mem (BLKmode
, symbol
);
2672 set_mem_align (initial_trampoline
, TRAMPOLINE_ALIGNMENT
);
2673 set_mem_size (initial_trampoline
, TRAMPOLINE_SIZE
);
2675 return initial_trampoline
;
2678 /* A and B are either alignments or offsets. Return the minimum alignment
2679 that may be assumed after adding the two together. */
2681 static inline unsigned
2682 min_align (unsigned int a
, unsigned int b
)
2684 return (a
| b
) & -(a
| b
);
2687 /* Return the assembler directive for creating a given kind of integer
2688 object. SIZE is the number of bytes in the object and ALIGNED_P
2689 indicates whether it is known to be aligned. Return NULL if the
2690 assembly dialect has no such directive.
2692 The returned string should be printed at the start of a new line and
2693 be followed immediately by the object's initial value. */
2696 integer_asm_op (int size
, int aligned_p
)
2698 struct asm_int_op
*ops
;
2701 ops
= &targetm
.asm_out
.aligned_op
;
2703 ops
= &targetm
.asm_out
.unaligned_op
;
2708 return targetm
.asm_out
.byte_op
;
2722 /* Use directive OP to assemble an integer object X. Print OP at the
2723 start of the line, followed immediately by the value of X. */
2726 assemble_integer_with_op (const char *op
, rtx x
)
2728 fputs (op
, asm_out_file
);
2729 output_addr_const (asm_out_file
, x
);
2730 fputc ('\n', asm_out_file
);
2733 /* The default implementation of the asm_out.integer target hook. */
2736 default_assemble_integer (rtx x ATTRIBUTE_UNUSED
,
2737 unsigned int size ATTRIBUTE_UNUSED
,
2738 int aligned_p ATTRIBUTE_UNUSED
)
2740 const char *op
= integer_asm_op (size
, aligned_p
);
2741 /* Avoid GAS bugs for large values. Specifically negative values whose
2742 absolute value fits in a bfd_vma, but not in a bfd_signed_vma. */
2743 if (size
> UNITS_PER_WORD
&& size
> POINTER_SIZE_UNITS
)
2745 return op
&& (assemble_integer_with_op (op
, x
), true);
2748 /* Assemble the integer constant X into an object of SIZE bytes. ALIGN is
2749 the alignment of the integer in bits. Return 1 if we were able to output
2750 the constant, otherwise 0. We must be able to output the constant,
2751 if FORCE is nonzero. */
2754 assemble_integer (rtx x
, unsigned int size
, unsigned int align
, int force
)
2758 aligned_p
= (align
>= MIN (size
* BITS_PER_UNIT
, BIGGEST_ALIGNMENT
));
2760 /* See if the target hook can handle this kind of object. */
2761 if (targetm
.asm_out
.integer (x
, size
, aligned_p
))
2764 /* If the object is a multi-byte one, try splitting it up. Split
2765 it into words it if is multi-word, otherwise split it into bytes. */
2768 machine_mode omode
, imode
;
2769 unsigned int subalign
;
2770 unsigned int subsize
, i
;
2771 enum mode_class mclass
;
2773 subsize
= size
> UNITS_PER_WORD
? UNITS_PER_WORD
: 1;
2774 subalign
= MIN (align
, subsize
* BITS_PER_UNIT
);
2775 if (GET_CODE (x
) == CONST_FIXED
)
2776 mclass
= GET_MODE_CLASS (GET_MODE (x
));
2780 omode
= mode_for_size (subsize
* BITS_PER_UNIT
, mclass
, 0);
2781 imode
= mode_for_size (size
* BITS_PER_UNIT
, mclass
, 0);
2783 for (i
= 0; i
< size
; i
+= subsize
)
2785 rtx partial
= simplify_subreg (omode
, x
, imode
, i
);
2786 if (!partial
|| !assemble_integer (partial
, subsize
, subalign
, 0))
2792 /* If we've printed some of it, but not all of it, there's no going
2797 gcc_assert (!force
);
2803 assemble_real (REAL_VALUE_TYPE d
, machine_mode mode
, unsigned int align
)
2805 long data
[4] = {0, 0, 0, 0};
2807 int bitsize
, nelts
, nunits
, units_per
;
2809 /* This is hairy. We have a quantity of known size. real_to_target
2810 will put it into an array of *host* longs, 32 bits per element
2811 (even if long is more than 32 bits). We need to determine the
2812 number of array elements that are occupied (nelts) and the number
2813 of *target* min-addressable units that will be occupied in the
2814 object file (nunits). We cannot assume that 32 divides the
2815 mode's bitsize (size * BITS_PER_UNIT) evenly.
2817 size * BITS_PER_UNIT is used here to make sure that padding bits
2818 (which might appear at either end of the value; real_to_target
2819 will include the padding bits in its output array) are included. */
2821 nunits
= GET_MODE_SIZE (mode
);
2822 bitsize
= nunits
* BITS_PER_UNIT
;
2823 nelts
= CEIL (bitsize
, 32);
2824 units_per
= 32 / BITS_PER_UNIT
;
2826 real_to_target (data
, &d
, mode
);
2828 /* Put out the first word with the specified alignment. */
2829 assemble_integer (GEN_INT (data
[0]), MIN (nunits
, units_per
), align
, 1);
2830 nunits
-= units_per
;
2832 /* Subsequent words need only 32-bit alignment. */
2833 align
= min_align (align
, 32);
2835 for (i
= 1; i
< nelts
; i
++)
2837 assemble_integer (GEN_INT (data
[i
]), MIN (nunits
, units_per
), align
, 1);
2838 nunits
-= units_per
;
2842 /* Given an expression EXP with a constant value,
2843 reduce it to the sum of an assembler symbol and an integer.
2844 Store them both in the structure *VALUE.
2845 EXP must be reducible. */
2849 HOST_WIDE_INT offset
;
2853 decode_addr_const (tree exp
, struct addr_const
*value
)
2855 tree target
= TREE_OPERAND (exp
, 0);
2861 if (TREE_CODE (target
) == COMPONENT_REF
2862 && tree_fits_shwi_p (byte_position (TREE_OPERAND (target
, 1))))
2864 offset
+= int_byte_position (TREE_OPERAND (target
, 1));
2865 target
= TREE_OPERAND (target
, 0);
2867 else if (TREE_CODE (target
) == ARRAY_REF
2868 || TREE_CODE (target
) == ARRAY_RANGE_REF
)
2870 offset
+= (tree_to_uhwi (TYPE_SIZE_UNIT (TREE_TYPE (target
)))
2871 * tree_to_shwi (TREE_OPERAND (target
, 1)));
2872 target
= TREE_OPERAND (target
, 0);
2874 else if (TREE_CODE (target
) == MEM_REF
2875 && TREE_CODE (TREE_OPERAND (target
, 0)) == ADDR_EXPR
)
2877 offset
+= mem_ref_offset (target
).to_short_addr ();
2878 target
= TREE_OPERAND (TREE_OPERAND (target
, 0), 0);
2880 else if (TREE_CODE (target
) == INDIRECT_REF
2881 && TREE_CODE (TREE_OPERAND (target
, 0)) == NOP_EXPR
2882 && TREE_CODE (TREE_OPERAND (TREE_OPERAND (target
, 0), 0))
2884 target
= TREE_OPERAND (TREE_OPERAND (TREE_OPERAND (target
, 0), 0), 0);
2889 switch (TREE_CODE (target
))
2893 x
= DECL_RTL (target
);
2897 x
= gen_rtx_MEM (FUNCTION_MODE
,
2898 gen_rtx_LABEL_REF (Pmode
, force_label_rtx (target
)));
2907 x
= output_constant_def (target
, 1);
2914 gcc_assert (MEM_P (x
));
2918 value
->offset
= offset
;
2921 static GTY(()) hash_table
<tree_descriptor_hasher
> *const_desc_htab
;
2923 static void maybe_output_constant_def_contents (struct constant_descriptor_tree
*, int);
2925 /* Constant pool accessor function. */
2927 hash_table
<tree_descriptor_hasher
> *
2928 constant_pool_htab (void)
2930 return const_desc_htab
;
2933 /* Compute a hash code for a constant expression. */
2936 tree_descriptor_hasher::hash (constant_descriptor_tree
*ptr
)
2942 const_hash_1 (const tree exp
)
2947 enum tree_code code
= TREE_CODE (exp
);
2949 /* Either set P and LEN to the address and len of something to hash and
2950 exit the switch or return a value. */
2955 p
= (char *) &TREE_INT_CST_ELT (exp
, 0);
2956 len
= TREE_INT_CST_NUNITS (exp
) * sizeof (HOST_WIDE_INT
);
2960 return real_hash (TREE_REAL_CST_PTR (exp
));
2963 return fixed_hash (TREE_FIXED_CST_PTR (exp
));
2966 p
= TREE_STRING_POINTER (exp
);
2967 len
= TREE_STRING_LENGTH (exp
);
2971 return (const_hash_1 (TREE_REALPART (exp
)) * 5
2972 + const_hash_1 (TREE_IMAGPART (exp
)));
2978 hi
= 7 + VECTOR_CST_NELTS (exp
);
2980 for (i
= 0; i
< VECTOR_CST_NELTS (exp
); ++i
)
2981 hi
= hi
* 563 + const_hash_1 (VECTOR_CST_ELT (exp
, i
));
2988 unsigned HOST_WIDE_INT idx
;
2991 hi
= 5 + int_size_in_bytes (TREE_TYPE (exp
));
2993 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, value
)
2995 hi
= hi
* 603 + const_hash_1 (value
);
3003 struct addr_const value
;
3005 decode_addr_const (exp
, &value
);
3006 switch (GET_CODE (value
.base
))
3009 /* Don't hash the address of the SYMBOL_REF;
3010 only use the offset and the symbol name. */
3012 p
= XSTR (value
.base
, 0);
3013 for (i
= 0; p
[i
] != 0; i
++)
3014 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3019 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (value
.base
)) * 13);
3029 case POINTER_PLUS_EXPR
:
3031 return (const_hash_1 (TREE_OPERAND (exp
, 0)) * 9
3032 + const_hash_1 (TREE_OPERAND (exp
, 1)));
3035 return const_hash_1 (TREE_OPERAND (exp
, 0)) * 7 + 2;
3038 /* A language specific constant. Just hash the code. */
3042 /* Compute hashing function. */
3044 for (i
= 0; i
< len
; i
++)
3045 hi
= ((hi
* 613) + (unsigned) (p
[i
]));
3050 /* Wrapper of compare_constant, for the htab interface. */
3052 tree_descriptor_hasher::equal (constant_descriptor_tree
*c1
,
3053 constant_descriptor_tree
*c2
)
3055 if (c1
->hash
!= c2
->hash
)
3057 return compare_constant (c1
->value
, c2
->value
);
3060 /* Compare t1 and t2, and return 1 only if they are known to result in
3061 the same bit pattern on output. */
3064 compare_constant (const tree t1
, const tree t2
)
3066 enum tree_code typecode
;
3068 if (t1
== NULL_TREE
)
3069 return t2
== NULL_TREE
;
3070 if (t2
== NULL_TREE
)
3073 if (TREE_CODE (t1
) != TREE_CODE (t2
))
3076 switch (TREE_CODE (t1
))
3079 /* Integer constants are the same only if the same width of type. */
3080 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3082 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3084 return tree_int_cst_equal (t1
, t2
);
3087 /* Real constants are the same only if the same width of type. */
3088 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3091 return REAL_VALUES_IDENTICAL (TREE_REAL_CST (t1
), TREE_REAL_CST (t2
));
3094 /* Fixed constants are the same only if the same width of type. */
3095 if (TYPE_PRECISION (TREE_TYPE (t1
)) != TYPE_PRECISION (TREE_TYPE (t2
)))
3098 return FIXED_VALUES_IDENTICAL (TREE_FIXED_CST (t1
), TREE_FIXED_CST (t2
));
3101 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
)))
3104 return (TREE_STRING_LENGTH (t1
) == TREE_STRING_LENGTH (t2
)
3105 && ! memcmp (TREE_STRING_POINTER (t1
), TREE_STRING_POINTER (t2
),
3106 TREE_STRING_LENGTH (t1
)));
3109 return (compare_constant (TREE_REALPART (t1
), TREE_REALPART (t2
))
3110 && compare_constant (TREE_IMAGPART (t1
), TREE_IMAGPART (t2
)));
3116 if (VECTOR_CST_NELTS (t1
) != VECTOR_CST_NELTS (t2
))
3119 for (i
= 0; i
< VECTOR_CST_NELTS (t1
); ++i
)
3120 if (!compare_constant (VECTOR_CST_ELT (t1
, i
),
3121 VECTOR_CST_ELT (t2
, i
)))
3129 vec
<constructor_elt
, va_gc
> *v1
, *v2
;
3130 unsigned HOST_WIDE_INT idx
;
3132 typecode
= TREE_CODE (TREE_TYPE (t1
));
3133 if (typecode
!= TREE_CODE (TREE_TYPE (t2
)))
3136 if (typecode
== ARRAY_TYPE
)
3138 HOST_WIDE_INT size_1
= int_size_in_bytes (TREE_TYPE (t1
));
3139 /* For arrays, check that the sizes all match. */
3140 if (TYPE_MODE (TREE_TYPE (t1
)) != TYPE_MODE (TREE_TYPE (t2
))
3142 || size_1
!= int_size_in_bytes (TREE_TYPE (t2
)))
3147 /* For record and union constructors, require exact type
3149 if (TREE_TYPE (t1
) != TREE_TYPE (t2
))
3153 v1
= CONSTRUCTOR_ELTS (t1
);
3154 v2
= CONSTRUCTOR_ELTS (t2
);
3155 if (vec_safe_length (v1
) != vec_safe_length (v2
))
3158 for (idx
= 0; idx
< vec_safe_length (v1
); ++idx
)
3160 constructor_elt
*c1
= &(*v1
)[idx
];
3161 constructor_elt
*c2
= &(*v2
)[idx
];
3163 /* Check that each value is the same... */
3164 if (!compare_constant (c1
->value
, c2
->value
))
3166 /* ... and that they apply to the same fields! */
3167 if (typecode
== ARRAY_TYPE
)
3169 if (!compare_constant (c1
->index
, c2
->index
))
3174 if (c1
->index
!= c2
->index
)
3185 struct addr_const value1
, value2
;
3189 decode_addr_const (t1
, &value1
);
3190 decode_addr_const (t2
, &value2
);
3192 if (value1
.offset
!= value2
.offset
)
3195 code
= GET_CODE (value1
.base
);
3196 if (code
!= GET_CODE (value2
.base
))
3202 ret
= (strcmp (XSTR (value1
.base
, 0), XSTR (value2
.base
, 0)) == 0);
3206 ret
= (CODE_LABEL_NUMBER (LABEL_REF_LABEL (value1
.base
))
3207 == CODE_LABEL_NUMBER (LABEL_REF_LABEL (value2
.base
)));
3217 case POINTER_PLUS_EXPR
:
3220 return (compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0))
3221 && compare_constant (TREE_OPERAND (t1
, 1), TREE_OPERAND (t2
, 1)));
3224 case VIEW_CONVERT_EXPR
:
3225 return compare_constant (TREE_OPERAND (t1
, 0), TREE_OPERAND (t2
, 0));
3234 /* Return the section into which constant EXP should be placed. */
3237 get_constant_section (tree exp
, unsigned int align
)
3239 return targetm
.asm_out
.select_section (exp
,
3240 compute_reloc_for_constant (exp
),
3244 /* Return the size of constant EXP in bytes. */
3246 static HOST_WIDE_INT
3247 get_constant_size (tree exp
)
3251 size
= int_size_in_bytes (TREE_TYPE (exp
));
3252 if (TREE_CODE (exp
) == STRING_CST
)
3253 size
= MAX (TREE_STRING_LENGTH (exp
), size
);
3257 /* Subroutine of output_constant_def:
3258 No constant equal to EXP is known to have been output.
3259 Make a constant descriptor to enter EXP in the hash table.
3260 Assign the label number and construct RTL to refer to the
3261 constant's location in memory.
3262 Caller is responsible for updating the hash table. */
3264 static struct constant_descriptor_tree
*
3265 build_constant_desc (tree exp
)
3267 struct constant_descriptor_tree
*desc
;
3273 desc
= ggc_alloc
<constant_descriptor_tree
> ();
3276 /* Create a string containing the label name, in LABEL. */
3277 labelno
= const_labelno
++;
3278 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", labelno
);
3280 /* Construct the VAR_DECL associated with the constant. */
3281 decl
= build_decl (UNKNOWN_LOCATION
, VAR_DECL
, get_identifier (label
),
3283 DECL_ARTIFICIAL (decl
) = 1;
3284 DECL_IGNORED_P (decl
) = 1;
3285 TREE_READONLY (decl
) = 1;
3286 TREE_STATIC (decl
) = 1;
3287 TREE_ADDRESSABLE (decl
) = 1;
3288 /* We don't set the RTL yet as this would cause varpool to assume that the
3289 variable is referenced. Moreover, it would just be dropped in LTO mode.
3290 Instead we set the flag that will be recognized in make_decl_rtl. */
3291 DECL_IN_CONSTANT_POOL (decl
) = 1;
3292 DECL_INITIAL (decl
) = desc
->value
;
3293 /* ??? CONSTANT_ALIGNMENT hasn't been updated for vector types on most
3294 architectures so use DATA_ALIGNMENT as well, except for strings. */
3295 if (TREE_CODE (exp
) == STRING_CST
)
3297 #ifdef CONSTANT_ALIGNMENT
3298 DECL_ALIGN (decl
) = CONSTANT_ALIGNMENT (exp
, DECL_ALIGN (decl
));
3302 align_variable (decl
, 0);
3304 /* Now construct the SYMBOL_REF and the MEM. */
3305 if (use_object_blocks_p ())
3307 int align
= (TREE_CODE (decl
) == CONST_DECL
3308 || (TREE_CODE (decl
) == VAR_DECL
3309 && DECL_IN_CONSTANT_POOL (decl
))
3311 : symtab_node::get (decl
)->definition_alignment ());
3312 section
*sect
= get_constant_section (exp
, align
);
3313 symbol
= create_block_symbol (ggc_strdup (label
),
3314 get_block_for_section (sect
), -1);
3317 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3318 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3319 SET_SYMBOL_REF_DECL (symbol
, decl
);
3320 TREE_CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3322 rtl
= gen_const_mem (TYPE_MODE (TREE_TYPE (exp
)), symbol
);
3323 set_mem_attributes (rtl
, exp
, 1);
3324 set_mem_alias_set (rtl
, 0);
3326 /* We cannot share RTX'es in pool entries.
3327 Mark this piece of RTL as required for unsharing. */
3328 RTX_FLAG (rtl
, used
) = 1;
3330 /* Set flags or add text to the name to record information, such as
3331 that it is a local symbol. If the name is changed, the macro
3332 ASM_OUTPUT_LABELREF will have to know how to strip this
3333 information. This call might invalidate our local variable
3334 SYMBOL; we can't use it afterward. */
3335 targetm
.encode_section_info (exp
, rtl
, true);
3342 /* Return an rtx representing a reference to constant data in memory
3343 for the constant expression EXP.
3345 If assembler code for such a constant has already been output,
3346 return an rtx to refer to it.
3347 Otherwise, output such a constant in memory
3348 and generate an rtx for it.
3350 If DEFER is nonzero, this constant can be deferred and output only
3351 if referenced in the function after all optimizations.
3353 `const_desc_table' records which constants already have label strings. */
3356 output_constant_def (tree exp
, int defer
)
3358 struct constant_descriptor_tree
*desc
;
3359 struct constant_descriptor_tree key
;
3361 /* Look up EXP in the table of constant descriptors. If we didn't find
3362 it, create a new one. */
3364 key
.hash
= const_hash_1 (exp
);
3365 constant_descriptor_tree
**loc
3366 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3371 desc
= build_constant_desc (exp
);
3372 desc
->hash
= key
.hash
;
3376 maybe_output_constant_def_contents (desc
, defer
);
3380 /* Subroutine of output_constant_def: Decide whether or not we need to
3381 output the constant DESC now, and if so, do it. */
3383 maybe_output_constant_def_contents (struct constant_descriptor_tree
*desc
,
3386 rtx symbol
= XEXP (desc
->rtl
, 0);
3387 tree exp
= desc
->value
;
3389 if (flag_syntax_only
)
3392 if (TREE_ASM_WRITTEN (exp
))
3393 /* Already output; don't do it again. */
3396 /* We can always defer constants as long as the context allows
3400 /* Increment n_deferred_constants if it exists. It needs to be at
3401 least as large as the number of constants actually referred to
3402 by the function. If it's too small we'll stop looking too early
3403 and fail to emit constants; if it's too large we'll only look
3404 through the entire function when we could have stopped earlier. */
3406 n_deferred_constants
++;
3410 output_constant_def_contents (symbol
);
3413 /* Subroutine of output_constant_def_contents. Output the definition
3414 of constant EXP, which is pointed to by label LABEL. ALIGN is the
3415 constant's alignment in bits. */
3418 assemble_constant_contents (tree exp
, const char *label
, unsigned int align
)
3422 size
= get_constant_size (exp
);
3424 /* Do any machine/system dependent processing of the constant. */
3425 targetm
.asm_out
.declare_constant_name (asm_out_file
, label
, exp
, size
);
3427 /* Output the value of EXP. */
3428 output_constant (exp
, size
, align
);
3430 targetm
.asm_out
.decl_end ();
3433 /* We must output the constant data referred to by SYMBOL; do so. */
3436 output_constant_def_contents (rtx symbol
)
3438 tree decl
= SYMBOL_REF_DECL (symbol
);
3439 tree exp
= DECL_INITIAL (decl
);
3440 bool asan_protected
= false;
3442 /* Make sure any other constants whose addresses appear in EXP
3443 are assigned label numbers. */
3444 output_addressed_constants (exp
);
3446 /* We are no longer deferring this constant. */
3447 TREE_ASM_WRITTEN (decl
) = TREE_ASM_WRITTEN (exp
) = 1;
3449 if ((flag_sanitize
& SANITIZE_ADDRESS
)
3450 && TREE_CODE (exp
) == STRING_CST
3451 && asan_protect_global (exp
))
3453 asan_protected
= true;
3454 DECL_ALIGN (decl
) = MAX (DECL_ALIGN (decl
),
3455 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
3458 /* If the constant is part of an object block, make sure that the
3459 decl has been positioned within its block, but do not write out
3460 its definition yet. output_object_blocks will do that later. */
3461 if (SYMBOL_REF_HAS_BLOCK_INFO_P (symbol
) && SYMBOL_REF_BLOCK (symbol
))
3462 place_block_symbol (symbol
);
3465 int align
= (TREE_CODE (decl
) == CONST_DECL
3466 || (TREE_CODE (decl
) == VAR_DECL
3467 && DECL_IN_CONSTANT_POOL (decl
))
3469 : symtab_node::get (decl
)->definition_alignment ());
3470 switch_to_section (get_constant_section (exp
, align
));
3471 if (align
> BITS_PER_UNIT
)
3472 ASM_OUTPUT_ALIGN (asm_out_file
, floor_log2 (align
/ BITS_PER_UNIT
));
3473 assemble_constant_contents (exp
, XSTR (symbol
, 0), align
);
3476 HOST_WIDE_INT size
= get_constant_size (exp
);
3477 assemble_zeros (asan_red_zone_size (size
));
3482 /* Look up EXP in the table of constant descriptors. Return the rtl
3483 if it has been emitted, else null. */
3486 lookup_constant_def (tree exp
)
3488 struct constant_descriptor_tree key
;
3491 key
.hash
= const_hash_1 (exp
);
3492 constant_descriptor_tree
*desc
3493 = const_desc_htab
->find_with_hash (&key
, key
.hash
);
3495 return (desc
? desc
->rtl
: NULL_RTX
);
3498 /* Return a tree representing a reference to constant data in memory
3499 for the constant expression EXP.
3501 This is the counterpart of output_constant_def at the Tree level. */
3504 tree_output_constant_def (tree exp
)
3506 struct constant_descriptor_tree
*desc
, key
;
3509 /* Look up EXP in the table of constant descriptors. If we didn't find
3510 it, create a new one. */
3512 key
.hash
= const_hash_1 (exp
);
3513 constant_descriptor_tree
**loc
3514 = const_desc_htab
->find_slot_with_hash (&key
, key
.hash
, INSERT
);
3519 desc
= build_constant_desc (exp
);
3520 desc
->hash
= key
.hash
;
3524 decl
= SYMBOL_REF_DECL (XEXP (desc
->rtl
, 0));
3525 varpool_node::finalize_decl (decl
);
3529 struct GTY((chain_next ("%h.next"), for_user
)) constant_descriptor_rtx
{
3530 struct constant_descriptor_rtx
*next
;
3534 HOST_WIDE_INT offset
;
3542 struct const_rtx_desc_hasher
: ggc_ptr_hash
<constant_descriptor_rtx
>
3544 static hashval_t
hash (constant_descriptor_rtx
*);
3545 static bool equal (constant_descriptor_rtx
*, constant_descriptor_rtx
*);
3548 /* Used in the hash tables to avoid outputting the same constant
3549 twice. Unlike 'struct constant_descriptor_tree', RTX constants
3550 are output once per function, not once per file. */
3551 /* ??? Only a few targets need per-function constant pools. Most
3552 can use one per-file pool. Should add a targetm bit to tell the
3555 struct GTY(()) rtx_constant_pool
{
3556 /* Pointers to first and last constant in pool, as ordered by offset. */
3557 struct constant_descriptor_rtx
*first
;
3558 struct constant_descriptor_rtx
*last
;
3560 /* Hash facility for making memory-constants from constant rtl-expressions.
3561 It is used on RISC machines where immediate integer arguments and
3562 constant addresses are restricted so that such constants must be stored
3564 hash_table
<const_rtx_desc_hasher
> *const_rtx_htab
;
3566 /* Current offset in constant pool (does not include any
3567 machine-specific header). */
3568 HOST_WIDE_INT offset
;
3571 /* Hash and compare functions for const_rtx_htab. */
3574 const_rtx_desc_hasher::hash (constant_descriptor_rtx
*desc
)
3580 const_rtx_desc_hasher::equal (constant_descriptor_rtx
*x
,
3581 constant_descriptor_rtx
*y
)
3583 if (x
->mode
!= y
->mode
)
3585 return rtx_equal_p (x
->constant
, y
->constant
);
3588 /* Hash one component of a constant. */
3591 const_rtx_hash_1 (const_rtx x
)
3593 unsigned HOST_WIDE_INT hwi
;
3599 code
= GET_CODE (x
);
3600 mode
= GET_MODE (x
);
3601 h
= (hashval_t
) code
* 1048573 + mode
;
3610 int shift
= sizeof (hashval_t
) * CHAR_BIT
;
3611 const int n
= sizeof (HOST_WIDE_INT
) / sizeof (hashval_t
);
3613 h
^= (hashval_t
) hwi
;
3614 for (i
= 1; i
< n
; ++i
)
3617 h
^= (hashval_t
) hwi
;
3622 case CONST_WIDE_INT
:
3623 hwi
= GET_MODE_PRECISION (mode
);
3625 for (i
= 0; i
< CONST_WIDE_INT_NUNITS (x
); i
++)
3626 hwi
^= CONST_WIDE_INT_ELT (x
, i
);
3631 if (TARGET_SUPPORTS_WIDE_INT
== 0 && mode
== VOIDmode
)
3633 hwi
= CONST_DOUBLE_LOW (x
) ^ CONST_DOUBLE_HIGH (x
);
3637 h
^= real_hash (CONST_DOUBLE_REAL_VALUE (x
));
3641 h
^= fixed_hash (CONST_FIXED_VALUE (x
));
3645 h
^= htab_hash_string (XSTR (x
, 0));
3649 h
= h
* 251 + CODE_LABEL_NUMBER (LABEL_REF_LABEL (x
));
3653 case UNSPEC_VOLATILE
:
3654 h
= h
* 251 + XINT (x
, 1);
3664 /* Compute a hash value for X, which should be a constant. */
3667 const_rtx_hash (rtx x
)
3670 subrtx_iterator::array_type array
;
3671 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
3672 h
= h
* 509 + const_rtx_hash_1 (*iter
);
3677 /* Create and return a new rtx constant pool. */
3679 static struct rtx_constant_pool
*
3680 create_constant_pool (void)
3682 struct rtx_constant_pool
*pool
;
3684 pool
= ggc_alloc
<rtx_constant_pool
> ();
3685 pool
->const_rtx_htab
= hash_table
<const_rtx_desc_hasher
>::create_ggc (31);
3692 /* Initialize constant pool hashing for a new function. */
3695 init_varasm_status (void)
3697 crtl
->varasm
.pool
= create_constant_pool ();
3698 crtl
->varasm
.deferred_constants
= 0;
3701 /* Given a MINUS expression, simplify it if both sides
3702 include the same symbol. */
3705 simplify_subtraction (rtx x
)
3707 rtx r
= simplify_rtx (x
);
3711 /* Given a constant rtx X, make (or find) a memory constant for its value
3712 and return a MEM rtx to refer to it in memory. */
3715 force_const_mem (machine_mode mode
, rtx x
)
3717 struct constant_descriptor_rtx
*desc
, tmp
;
3718 struct rtx_constant_pool
*pool
;
3723 constant_descriptor_rtx
**slot
;
3725 /* If we're not allowed to drop X into the constant pool, don't. */
3726 if (targetm
.cannot_force_const_mem (mode
, x
))
3729 /* Record that this function has used a constant pool entry. */
3730 crtl
->uses_const_pool
= 1;
3732 /* Decide which pool to use. */
3733 pool
= (targetm
.use_blocks_for_constant_p (mode
, x
)
3734 ? shared_constant_pool
3735 : crtl
->varasm
.pool
);
3737 /* Lookup the value in the hashtable. */
3740 hash
= const_rtx_hash (x
);
3741 slot
= pool
->const_rtx_htab
->find_slot_with_hash (&tmp
, hash
, INSERT
);
3744 /* If the constant was already present, return its memory. */
3746 return copy_rtx (desc
->mem
);
3748 /* Otherwise, create a new descriptor. */
3749 desc
= ggc_alloc
<constant_descriptor_rtx
> ();
3752 /* Align the location counter as required by EXP's data type. */
3753 align
= GET_MODE_ALIGNMENT (mode
== VOIDmode
? word_mode
: mode
);
3754 #ifdef CONSTANT_ALIGNMENT
3756 tree type
= lang_hooks
.types
.type_for_mode (mode
, 0);
3757 if (type
!= NULL_TREE
)
3758 align
= CONSTANT_ALIGNMENT (make_tree (type
, x
), align
);
3762 pool
->offset
+= (align
/ BITS_PER_UNIT
) - 1;
3763 pool
->offset
&= ~ ((align
/ BITS_PER_UNIT
) - 1);
3766 desc
->constant
= copy_rtx (tmp
.constant
);
3767 desc
->offset
= pool
->offset
;
3770 desc
->align
= align
;
3771 desc
->labelno
= const_labelno
;
3774 pool
->offset
+= GET_MODE_SIZE (mode
);
3776 pool
->last
->next
= desc
;
3778 pool
->first
= pool
->last
= desc
;
3781 /* Create a string containing the label name, in LABEL. */
3782 ASM_GENERATE_INTERNAL_LABEL (label
, "LC", const_labelno
);
3785 /* Construct the SYMBOL_REF. Make sure to mark it as belonging to
3786 the constants pool. */
3787 if (use_object_blocks_p () && targetm
.use_blocks_for_constant_p (mode
, x
))
3789 section
*sect
= targetm
.asm_out
.select_rtx_section (mode
, x
, align
);
3790 symbol
= create_block_symbol (ggc_strdup (label
),
3791 get_block_for_section (sect
), -1);
3794 symbol
= gen_rtx_SYMBOL_REF (Pmode
, ggc_strdup (label
));
3796 SYMBOL_REF_FLAGS (symbol
) |= SYMBOL_FLAG_LOCAL
;
3797 CONSTANT_POOL_ADDRESS_P (symbol
) = 1;
3798 SET_SYMBOL_REF_CONSTANT (symbol
, desc
);
3800 /* Construct the MEM. */
3801 desc
->mem
= def
= gen_const_mem (mode
, symbol
);
3802 set_mem_attributes (def
, lang_hooks
.types
.type_for_mode (mode
, 0), 1);
3803 set_mem_align (def
, align
);
3805 /* If we're dropping a label to the constant pool, make sure we
3807 if (GET_CODE (x
) == LABEL_REF
)
3808 LABEL_PRESERVE_P (XEXP (x
, 0)) = 1;
3810 return copy_rtx (def
);
3813 /* Given a constant pool SYMBOL_REF, return the corresponding constant. */
3816 get_pool_constant (const_rtx addr
)
3818 return SYMBOL_REF_CONSTANT (addr
)->constant
;
3821 /* Given a constant pool SYMBOL_REF, return the corresponding constant
3822 and whether it has been output or not. */
3825 get_pool_constant_mark (rtx addr
, bool *pmarked
)
3827 struct constant_descriptor_rtx
*desc
;
3829 desc
= SYMBOL_REF_CONSTANT (addr
);
3830 *pmarked
= (desc
->mark
!= 0);
3831 return desc
->constant
;
3834 /* Similar, return the mode. */
3837 get_pool_mode (const_rtx addr
)
3839 return SYMBOL_REF_CONSTANT (addr
)->mode
;
3842 /* Return the size of the constant pool. */
3845 get_pool_size (void)
3847 return crtl
->varasm
.pool
->offset
;
3850 /* Worker function for output_constant_pool_1. Emit assembly for X
3851 in MODE with known alignment ALIGN. */
3854 output_constant_pool_2 (machine_mode mode
, rtx x
, unsigned int align
)
3856 switch (GET_MODE_CLASS (mode
))
3859 case MODE_DECIMAL_FLOAT
:
3863 gcc_assert (CONST_DOUBLE_AS_FLOAT_P (x
));
3864 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
3865 assemble_real (r
, mode
, align
);
3870 case MODE_PARTIAL_INT
:
3875 case MODE_POINTER_BOUNDS
:
3876 assemble_integer (x
, GET_MODE_SIZE (mode
), align
, 1);
3879 case MODE_VECTOR_FLOAT
:
3880 case MODE_VECTOR_INT
:
3881 case MODE_VECTOR_FRACT
:
3882 case MODE_VECTOR_UFRACT
:
3883 case MODE_VECTOR_ACCUM
:
3884 case MODE_VECTOR_UACCUM
:
3887 machine_mode submode
= GET_MODE_INNER (mode
);
3888 unsigned int subalign
= MIN (align
, GET_MODE_BITSIZE (submode
));
3890 gcc_assert (GET_CODE (x
) == CONST_VECTOR
);
3891 units
= CONST_VECTOR_NUNITS (x
);
3893 for (i
= 0; i
< units
; i
++)
3895 rtx elt
= CONST_VECTOR_ELT (x
, i
);
3896 output_constant_pool_2 (submode
, elt
, i
? subalign
: align
);
3906 /* Worker function for output_constant_pool. Emit constant DESC,
3907 giving it ALIGN bits of alignment. */
3910 output_constant_pool_1 (struct constant_descriptor_rtx
*desc
,
3917 /* See if X is a LABEL_REF (or a CONST referring to a LABEL_REF)
3918 whose CODE_LABEL has been deleted. This can occur if a jump table
3919 is eliminated by optimization. If so, write a constant of zero
3920 instead. Note that this can also happen by turning the
3921 CODE_LABEL into a NOTE. */
3922 /* ??? This seems completely and utterly wrong. Certainly it's
3923 not true for NOTE_INSN_DELETED_LABEL, but I disbelieve proper
3924 functioning even with rtx_insn::deleted and friends. */
3927 switch (GET_CODE (tmp
))
3930 if (GET_CODE (XEXP (tmp
, 0)) != PLUS
3931 || GET_CODE (XEXP (XEXP (tmp
, 0), 0)) != LABEL_REF
)
3933 tmp
= XEXP (XEXP (tmp
, 0), 0);
3937 tmp
= LABEL_REF_LABEL (tmp
);
3938 gcc_assert (!as_a
<rtx_insn
*> (tmp
)->deleted ());
3939 gcc_assert (!NOTE_P (tmp
)
3940 || NOTE_KIND (tmp
) != NOTE_INSN_DELETED
);
3947 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3948 ASM_OUTPUT_SPECIAL_POOL_ENTRY (asm_out_file
, x
, desc
->mode
,
3949 align
, desc
->labelno
, done
);
3952 assemble_align (align
);
3954 /* Output the label. */
3955 targetm
.asm_out
.internal_label (asm_out_file
, "LC", desc
->labelno
);
3958 Pass actual alignment value while emitting string constant to asm code
3959 as function 'output_constant_pool_1' explicitly passes the alignment as 1
3960 assuming that the data is already aligned which prevents the generation
3961 of fix-up table entries. */
3962 output_constant_pool_2 (desc
->mode
, x
, desc
->align
);
3964 /* Make sure all constants in SECTION_MERGE and not SECTION_STRINGS
3965 sections have proper size. */
3966 if (align
> GET_MODE_BITSIZE (desc
->mode
)
3968 && (in_section
->common
.flags
& SECTION_MERGE
))
3969 assemble_align (align
);
3971 #ifdef ASM_OUTPUT_SPECIAL_POOL_ENTRY
3977 /* Mark all constants that are referenced by SYMBOL_REFs in X.
3978 Emit referenced deferred strings. */
3981 mark_constants_in_pattern (rtx insn
)
3983 subrtx_iterator::array_type array
;
3984 FOR_EACH_SUBRTX (iter
, array
, PATTERN (insn
), ALL
)
3986 const_rtx x
= *iter
;
3987 if (GET_CODE (x
) == SYMBOL_REF
)
3989 if (CONSTANT_POOL_ADDRESS_P (x
))
3991 struct constant_descriptor_rtx
*desc
= SYMBOL_REF_CONSTANT (x
);
3992 if (desc
->mark
== 0)
3995 iter
.substitute (desc
->constant
);
3998 else if (TREE_CONSTANT_POOL_ADDRESS_P (x
))
4000 tree decl
= SYMBOL_REF_DECL (x
);
4001 if (!TREE_ASM_WRITTEN (DECL_INITIAL (decl
)))
4003 n_deferred_constants
--;
4004 output_constant_def_contents (CONST_CAST_RTX (x
));
4011 /* Look through appropriate parts of INSN, marking all entries in the
4012 constant pool which are actually being used. Entries that are only
4013 referenced by other constants are also marked as used. Emit
4014 deferred strings that are used. */
4017 mark_constants (rtx_insn
*insn
)
4022 /* Insns may appear inside a SEQUENCE. Only check the patterns of
4023 insns, not any notes that may be attached. We don't want to mark
4024 a constant just because it happens to appear in a REG_EQUIV note. */
4025 if (rtx_sequence
*seq
= dyn_cast
<rtx_sequence
*> (PATTERN (insn
)))
4027 int i
, n
= seq
->len ();
4028 for (i
= 0; i
< n
; ++i
)
4030 rtx subinsn
= seq
->element (i
);
4031 if (INSN_P (subinsn
))
4032 mark_constants_in_pattern (subinsn
);
4036 mark_constants_in_pattern (insn
);
4039 /* Look through the instructions for this function, and mark all the
4040 entries in POOL which are actually being used. Emit deferred constants
4041 which have indeed been used. */
4044 mark_constant_pool (void)
4048 if (!crtl
->uses_const_pool
&& n_deferred_constants
== 0)
4051 for (insn
= get_insns (); insn
; insn
= NEXT_INSN (insn
))
4052 mark_constants (insn
);
4055 /* Write all the constants in POOL. */
4058 output_constant_pool_contents (struct rtx_constant_pool
*pool
)
4060 struct constant_descriptor_rtx
*desc
;
4062 for (desc
= pool
->first
; desc
; desc
= desc
->next
)
4065 /* If the constant is part of an object_block, make sure that
4066 the constant has been positioned within its block, but do not
4067 write out its definition yet. output_object_blocks will do
4069 if (SYMBOL_REF_HAS_BLOCK_INFO_P (desc
->sym
)
4070 && SYMBOL_REF_BLOCK (desc
->sym
))
4071 place_block_symbol (desc
->sym
);
4074 switch_to_section (targetm
.asm_out
.select_rtx_section
4075 (desc
->mode
, desc
->constant
, desc
->align
));
4076 output_constant_pool_1 (desc
, desc
->align
);
4081 /* Mark all constants that are used in the current function, then write
4082 out the function's private constant pool. */
4085 output_constant_pool (const char *fnname ATTRIBUTE_UNUSED
,
4086 tree fndecl ATTRIBUTE_UNUSED
)
4088 struct rtx_constant_pool
*pool
= crtl
->varasm
.pool
;
4090 /* It is possible for gcc to call force_const_mem and then to later
4091 discard the instructions which refer to the constant. In such a
4092 case we do not need to output the constant. */
4093 mark_constant_pool ();
4095 #ifdef ASM_OUTPUT_POOL_PROLOGUE
4096 ASM_OUTPUT_POOL_PROLOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4099 output_constant_pool_contents (pool
);
4101 #ifdef ASM_OUTPUT_POOL_EPILOGUE
4102 ASM_OUTPUT_POOL_EPILOGUE (asm_out_file
, fnname
, fndecl
, pool
->offset
);
4106 /* Write the contents of the shared constant pool. */
4109 output_shared_constant_pool (void)
4111 output_constant_pool_contents (shared_constant_pool
);
4114 /* Determine what kind of relocations EXP may need. */
4117 compute_reloc_for_constant (tree exp
)
4119 int reloc
= 0, reloc2
;
4122 switch (TREE_CODE (exp
))
4126 /* Go inside any operations that get_inner_reference can handle and see
4127 if what's inside is a constant: no need to do anything here for
4128 addresses of variables or functions. */
4129 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4130 tem
= TREE_OPERAND (tem
, 0))
4133 if (TREE_CODE (tem
) == MEM_REF
4134 && TREE_CODE (TREE_OPERAND (tem
, 0)) == ADDR_EXPR
)
4136 reloc
= compute_reloc_for_constant (TREE_OPERAND (tem
, 0));
4140 if (!targetm
.binds_local_p (tem
))
4147 case POINTER_PLUS_EXPR
:
4148 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4149 reloc
|= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4153 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4154 reloc2
= compute_reloc_for_constant (TREE_OPERAND (exp
, 1));
4155 /* The difference of two local labels is computable at link time. */
4156 if (reloc
== 1 && reloc2
== 1)
4163 case VIEW_CONVERT_EXPR
:
4164 reloc
= compute_reloc_for_constant (TREE_OPERAND (exp
, 0));
4169 unsigned HOST_WIDE_INT idx
;
4170 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4172 reloc
|= compute_reloc_for_constant (tem
);
4182 /* Find all the constants whose addresses are referenced inside of EXP,
4183 and make sure assembler code with a label has been output for each one.
4184 Indicate whether an ADDR_EXPR has been encountered. */
4187 output_addressed_constants (tree exp
)
4191 switch (TREE_CODE (exp
))
4195 /* Go inside any operations that get_inner_reference can handle and see
4196 if what's inside is a constant: no need to do anything here for
4197 addresses of variables or functions. */
4198 for (tem
= TREE_OPERAND (exp
, 0); handled_component_p (tem
);
4199 tem
= TREE_OPERAND (tem
, 0))
4202 /* If we have an initialized CONST_DECL, retrieve the initializer. */
4203 if (TREE_CODE (tem
) == CONST_DECL
&& DECL_INITIAL (tem
))
4204 tem
= DECL_INITIAL (tem
);
4206 if (CONSTANT_CLASS_P (tem
) || TREE_CODE (tem
) == CONSTRUCTOR
)
4207 output_constant_def (tem
, 0);
4209 if (TREE_CODE (tem
) == MEM_REF
)
4210 output_addressed_constants (TREE_OPERAND (tem
, 0));
4214 case POINTER_PLUS_EXPR
:
4216 output_addressed_constants (TREE_OPERAND (exp
, 1));
4220 case VIEW_CONVERT_EXPR
:
4221 output_addressed_constants (TREE_OPERAND (exp
, 0));
4226 unsigned HOST_WIDE_INT idx
;
4227 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (exp
), idx
, tem
)
4229 output_addressed_constants (tem
);
4238 /* Whether a constructor CTOR is a valid static constant initializer if all
4239 its elements are. This used to be internal to initializer_constant_valid_p
4240 and has been exposed to let other functions like categorize_ctor_elements
4241 evaluate the property while walking a constructor for other purposes. */
4244 constructor_static_from_elts_p (const_tree ctor
)
4246 return (TREE_CONSTANT (ctor
)
4247 && (TREE_CODE (TREE_TYPE (ctor
)) == UNION_TYPE
4248 || TREE_CODE (TREE_TYPE (ctor
)) == RECORD_TYPE
4249 || TREE_CODE (TREE_TYPE (ctor
)) == ARRAY_TYPE
));
4252 static tree
initializer_constant_valid_p_1 (tree value
, tree endtype
,
4255 /* A subroutine of initializer_constant_valid_p. VALUE is a MINUS_EXPR,
4256 PLUS_EXPR or POINTER_PLUS_EXPR. This looks for cases of VALUE
4257 which are valid when ENDTYPE is an integer of any size; in
4258 particular, this does not accept a pointer minus a constant. This
4259 returns null_pointer_node if the VALUE is an absolute constant
4260 which can be used to initialize a static variable. Otherwise it
4264 narrowing_initializer_constant_valid_p (tree value
, tree endtype
, tree
*cache
)
4268 if (!INTEGRAL_TYPE_P (endtype
))
4271 op0
= TREE_OPERAND (value
, 0);
4272 op1
= TREE_OPERAND (value
, 1);
4274 /* Like STRIP_NOPS except allow the operand mode to widen. This
4275 works around a feature of fold that simplifies (int)(p1 - p2) to
4276 ((int)p1 - (int)p2) under the theory that the narrower operation
4279 while (CONVERT_EXPR_P (op0
)
4280 || TREE_CODE (op0
) == NON_LVALUE_EXPR
)
4282 tree inner
= TREE_OPERAND (op0
, 0);
4283 if (inner
== error_mark_node
4284 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4285 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op0
)))
4286 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4291 while (CONVERT_EXPR_P (op1
)
4292 || TREE_CODE (op1
) == NON_LVALUE_EXPR
)
4294 tree inner
= TREE_OPERAND (op1
, 0);
4295 if (inner
== error_mark_node
4296 || ! INTEGRAL_MODE_P (TYPE_MODE (TREE_TYPE (inner
)))
4297 || (GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (op1
)))
4298 > GET_MODE_SIZE (TYPE_MODE (TREE_TYPE (inner
)))))
4303 op0
= initializer_constant_valid_p_1 (op0
, endtype
, cache
);
4307 op1
= initializer_constant_valid_p_1 (op1
, endtype
,
4308 cache
? cache
+ 2 : NULL
);
4309 /* Both initializers must be known. */
4313 && (op0
== null_pointer_node
4314 || TREE_CODE (value
) == MINUS_EXPR
))
4315 return null_pointer_node
;
4317 /* Support differences between labels. */
4318 if (TREE_CODE (op0
) == LABEL_DECL
4319 && TREE_CODE (op1
) == LABEL_DECL
)
4320 return null_pointer_node
;
4322 if (TREE_CODE (op0
) == STRING_CST
4323 && TREE_CODE (op1
) == STRING_CST
4324 && operand_equal_p (op0
, op1
, 1))
4325 return null_pointer_node
;
4331 /* Helper function of initializer_constant_valid_p.
4332 Return nonzero if VALUE is a valid constant-valued expression
4333 for use in initializing a static variable; one that can be an
4334 element of a "constant" initializer.
4336 Return null_pointer_node if the value is absolute;
4337 if it is relocatable, return the variable that determines the relocation.
4338 We assume that VALUE has been folded as much as possible;
4339 therefore, we do not need to check for such things as
4340 arithmetic-combinations of integers.
4342 Use CACHE (pointer to 2 tree values) for caching if non-NULL. */
4345 initializer_constant_valid_p_1 (tree value
, tree endtype
, tree
*cache
)
4349 switch (TREE_CODE (value
))
4352 if (constructor_static_from_elts_p (value
))
4354 unsigned HOST_WIDE_INT idx
;
4356 bool absolute
= true;
4358 if (cache
&& cache
[0] == value
)
4360 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4363 reloc
= initializer_constant_valid_p_1 (elt
, TREE_TYPE (elt
),
4370 cache
[1] = NULL_TREE
;
4374 if (reloc
!= null_pointer_node
)
4377 /* For a non-absolute relocation, there is no single
4378 variable that can be "the variable that determines the
4383 cache
[1] = absolute
? null_pointer_node
: error_mark_node
;
4385 return absolute
? null_pointer_node
: error_mark_node
;
4388 return TREE_STATIC (value
) ? null_pointer_node
: NULL_TREE
;
4396 return null_pointer_node
;
4401 tree op0
= staticp (TREE_OPERAND (value
, 0));
4404 /* "&(*a).f" is like unto pointer arithmetic. If "a" turns out
4405 to be a constant, this is old-skool offsetof-like nonsense. */
4406 if (TREE_CODE (op0
) == INDIRECT_REF
4407 && TREE_CONSTANT (TREE_OPERAND (op0
, 0)))
4408 return null_pointer_node
;
4409 /* Taking the address of a nested function involves a trampoline,
4410 unless we don't need or want one. */
4411 if (TREE_CODE (op0
) == FUNCTION_DECL
4412 && DECL_STATIC_CHAIN (op0
)
4413 && !TREE_NO_TRAMPOLINE (value
))
4415 /* "&{...}" requires a temporary to hold the constructed
4417 if (TREE_CODE (op0
) == CONSTRUCTOR
)
4423 case NON_LVALUE_EXPR
:
4424 return initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4427 case VIEW_CONVERT_EXPR
:
4429 tree src
= TREE_OPERAND (value
, 0);
4430 tree src_type
= TREE_TYPE (src
);
4431 tree dest_type
= TREE_TYPE (value
);
4433 /* Allow view-conversions from aggregate to non-aggregate type only
4434 if the bit pattern is fully preserved afterwards; otherwise, the
4435 RTL expander won't be able to apply a subsequent transformation
4436 to the underlying constructor. */
4437 if (AGGREGATE_TYPE_P (src_type
) && !AGGREGATE_TYPE_P (dest_type
))
4439 if (TYPE_MODE (endtype
) == TYPE_MODE (dest_type
))
4440 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4445 /* Allow all other kinds of view-conversion. */
4446 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4451 tree src
= TREE_OPERAND (value
, 0);
4452 tree src_type
= TREE_TYPE (src
);
4453 tree dest_type
= TREE_TYPE (value
);
4455 /* Allow conversions between pointer types, floating-point
4456 types, and offset types. */
4457 if ((POINTER_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
))
4458 || (FLOAT_TYPE_P (dest_type
) && FLOAT_TYPE_P (src_type
))
4459 || (TREE_CODE (dest_type
) == OFFSET_TYPE
4460 && TREE_CODE (src_type
) == OFFSET_TYPE
))
4461 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4463 /* Allow length-preserving conversions between integer types. */
4464 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
)
4465 && (TYPE_PRECISION (dest_type
) == TYPE_PRECISION (src_type
)))
4466 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4468 /* Allow conversions between other integer types only if
4470 if (INTEGRAL_TYPE_P (dest_type
) && INTEGRAL_TYPE_P (src_type
))
4472 tree inner
= initializer_constant_valid_p_1 (src
, endtype
, cache
);
4473 if (inner
== null_pointer_node
)
4474 return null_pointer_node
;
4478 /* Allow (int) &foo provided int is as wide as a pointer. */
4479 if (INTEGRAL_TYPE_P (dest_type
) && POINTER_TYPE_P (src_type
)
4480 && (TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
)))
4481 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4483 /* Likewise conversions from int to pointers, but also allow
4484 conversions from 0. */
4485 if ((POINTER_TYPE_P (dest_type
)
4486 || TREE_CODE (dest_type
) == OFFSET_TYPE
)
4487 && INTEGRAL_TYPE_P (src_type
))
4489 if (TREE_CODE (src
) == INTEGER_CST
4490 && TYPE_PRECISION (dest_type
) >= TYPE_PRECISION (src_type
))
4491 return null_pointer_node
;
4492 if (integer_zerop (src
))
4493 return null_pointer_node
;
4494 else if (TYPE_PRECISION (dest_type
) <= TYPE_PRECISION (src_type
))
4495 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4498 /* Allow conversions to struct or union types if the value
4500 if (TREE_CODE (dest_type
) == RECORD_TYPE
4501 || TREE_CODE (dest_type
) == UNION_TYPE
)
4502 return initializer_constant_valid_p_1 (src
, endtype
, cache
);
4506 case POINTER_PLUS_EXPR
:
4508 /* Any valid floating-point constants will have been folded by now;
4509 with -frounding-math we hit this with addition of two constants. */
4510 if (TREE_CODE (endtype
) == REAL_TYPE
)
4512 if (cache
&& cache
[0] == value
)
4514 if (! INTEGRAL_TYPE_P (endtype
)
4515 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4517 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4519 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4522 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4523 endtype
, ncache
+ 2);
4524 /* If either term is absolute, use the other term's relocation. */
4525 if (valid0
== null_pointer_node
)
4527 else if (valid1
== null_pointer_node
)
4529 /* Support narrowing pointer differences. */
4531 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4535 /* Support narrowing pointer differences. */
4536 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4545 if (TREE_CODE (endtype
) == REAL_TYPE
)
4547 if (cache
&& cache
[0] == value
)
4549 if (! INTEGRAL_TYPE_P (endtype
)
4550 || TYPE_PRECISION (endtype
) >= TYPE_PRECISION (TREE_TYPE (value
)))
4552 tree ncache
[4] = { NULL_TREE
, NULL_TREE
, NULL_TREE
, NULL_TREE
};
4554 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 0),
4557 = initializer_constant_valid_p_1 (TREE_OPERAND (value
, 1),
4558 endtype
, ncache
+ 2);
4559 /* Win if second argument is absolute. */
4560 if (valid1
== null_pointer_node
)
4562 /* Win if both arguments have the same relocation.
4563 Then the value is absolute. */
4564 else if (valid0
== valid1
&& valid0
!= 0)
4565 ret
= null_pointer_node
;
4566 /* Since GCC guarantees that string constants are unique in the
4567 generated code, a subtraction between two copies of the same
4568 constant string is absolute. */
4569 else if (valid0
&& TREE_CODE (valid0
) == STRING_CST
4570 && valid1
&& TREE_CODE (valid1
) == STRING_CST
4571 && operand_equal_p (valid0
, valid1
, 1))
4572 ret
= null_pointer_node
;
4573 /* Support narrowing differences. */
4575 ret
= narrowing_initializer_constant_valid_p (value
, endtype
,
4579 /* Support narrowing differences. */
4580 ret
= narrowing_initializer_constant_valid_p (value
, endtype
, NULL
);
4595 /* Return nonzero if VALUE is a valid constant-valued expression
4596 for use in initializing a static variable; one that can be an
4597 element of a "constant" initializer.
4599 Return null_pointer_node if the value is absolute;
4600 if it is relocatable, return the variable that determines the relocation.
4601 We assume that VALUE has been folded as much as possible;
4602 therefore, we do not need to check for such things as
4603 arithmetic-combinations of integers. */
4605 initializer_constant_valid_p (tree value
, tree endtype
)
4607 return initializer_constant_valid_p_1 (value
, endtype
, NULL
);
4610 /* Return true if VALUE is a valid constant-valued expression
4611 for use in initializing a static bit-field; one that can be
4612 an element of a "constant" initializer. */
4615 initializer_constant_valid_for_bitfield_p (tree value
)
4617 /* For bitfields we support integer constants or possibly nested aggregates
4619 switch (TREE_CODE (value
))
4623 unsigned HOST_WIDE_INT idx
;
4626 FOR_EACH_CONSTRUCTOR_VALUE (CONSTRUCTOR_ELTS (value
), idx
, elt
)
4627 if (!initializer_constant_valid_for_bitfield_p (elt
))
4636 case VIEW_CONVERT_EXPR
:
4637 case NON_LVALUE_EXPR
:
4639 initializer_constant_valid_for_bitfield_p (TREE_OPERAND (value
, 0));
4648 /* output_constructor outer state of relevance in recursive calls, typically
4649 for nested aggregate bitfields. */
4652 unsigned int bit_offset
; /* current position in ... */
4653 int byte
; /* ... the outer byte buffer. */
4656 static unsigned HOST_WIDE_INT
4657 output_constructor (tree
, unsigned HOST_WIDE_INT
, unsigned int,
4660 /* Output assembler code for constant EXP, with no label.
4661 This includes the pseudo-op such as ".int" or ".byte", and a newline.
4662 Assumes output_addressed_constants has been done on EXP already.
4664 Generate at least SIZE bytes of assembler data, padding at the end
4665 with zeros if necessary. SIZE must always be specified. The returned
4666 value is the actual number of bytes of assembler data generated, which
4667 may be bigger than SIZE if the object contains a variable length field.
4669 SIZE is important for structure constructors,
4670 since trailing members may have been omitted from the constructor.
4671 It is also important for initialization of arrays from string constants
4672 since the full length of the string constant might not be wanted.
4673 It is also needed for initialization of unions, where the initializer's
4674 type is just one member, and that may not be as long as the union.
4676 There a case in which we would fail to output exactly SIZE bytes:
4677 for a structure constructor that wants to produce more than SIZE bytes.
4678 But such constructors will never be generated for any possible input.
4680 ALIGN is the alignment of the data in bits. */
4682 static unsigned HOST_WIDE_INT
4683 output_constant (tree exp
, unsigned HOST_WIDE_INT size
, unsigned int align
)
4685 enum tree_code code
;
4686 unsigned HOST_WIDE_INT thissize
;
4688 if (size
== 0 || flag_syntax_only
)
4691 /* See if we're trying to initialize a pointer in a non-default mode
4692 to the address of some declaration somewhere. If the target says
4693 the mode is valid for pointers, assume the target has a way of
4695 if (TREE_CODE (exp
) == NOP_EXPR
4696 && POINTER_TYPE_P (TREE_TYPE (exp
))
4697 && targetm
.addr_space
.valid_pointer_mode
4698 (TYPE_MODE (TREE_TYPE (exp
)),
4699 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4701 tree saved_type
= TREE_TYPE (exp
);
4703 /* Peel off any intermediate conversions-to-pointer for valid
4705 while (TREE_CODE (exp
) == NOP_EXPR
4706 && POINTER_TYPE_P (TREE_TYPE (exp
))
4707 && targetm
.addr_space
.valid_pointer_mode
4708 (TYPE_MODE (TREE_TYPE (exp
)),
4709 TYPE_ADDR_SPACE (TREE_TYPE (TREE_TYPE (exp
)))))
4710 exp
= TREE_OPERAND (exp
, 0);
4712 /* If what we're left with is the address of something, we can
4713 convert the address to the final type and output it that
4715 if (TREE_CODE (exp
) == ADDR_EXPR
)
4716 exp
= build1 (ADDR_EXPR
, saved_type
, TREE_OPERAND (exp
, 0));
4717 /* Likewise for constant ints. */
4718 else if (TREE_CODE (exp
) == INTEGER_CST
)
4719 exp
= wide_int_to_tree (saved_type
, exp
);
4723 /* Eliminate any conversions since we'll be outputting the underlying
4725 while (CONVERT_EXPR_P (exp
)
4726 || TREE_CODE (exp
) == NON_LVALUE_EXPR
4727 || TREE_CODE (exp
) == VIEW_CONVERT_EXPR
)
4729 HOST_WIDE_INT type_size
= int_size_in_bytes (TREE_TYPE (exp
));
4730 HOST_WIDE_INT op_size
= int_size_in_bytes (TREE_TYPE (TREE_OPERAND (exp
, 0)));
4732 /* Make sure eliminating the conversion is really a no-op, except with
4733 VIEW_CONVERT_EXPRs to allow for wild Ada unchecked conversions and
4734 union types to allow for Ada unchecked unions. */
4735 if (type_size
> op_size
4736 && TREE_CODE (exp
) != VIEW_CONVERT_EXPR
4737 && TREE_CODE (TREE_TYPE (exp
)) != UNION_TYPE
)
4738 /* Keep the conversion. */
4741 exp
= TREE_OPERAND (exp
, 0);
4744 code
= TREE_CODE (TREE_TYPE (exp
));
4745 thissize
= int_size_in_bytes (TREE_TYPE (exp
));
4747 /* Allow a constructor with no elements for any data type.
4748 This means to fill the space with zeros. */
4749 if (TREE_CODE (exp
) == CONSTRUCTOR
4750 && vec_safe_is_empty (CONSTRUCTOR_ELTS (exp
)))
4752 assemble_zeros (size
);
4756 if (TREE_CODE (exp
) == FDESC_EXPR
)
4758 #ifdef ASM_OUTPUT_FDESC
4759 HOST_WIDE_INT part
= tree_to_shwi (TREE_OPERAND (exp
, 1));
4760 tree decl
= TREE_OPERAND (exp
, 0);
4761 ASM_OUTPUT_FDESC (asm_out_file
, decl
, part
);
4768 /* Now output the underlying data. If we've handling the padding, return.
4769 Otherwise, break and ensure SIZE is the size written. */
4776 case REFERENCE_TYPE
:
4778 case FIXED_POINT_TYPE
:
4779 case POINTER_BOUNDS_TYPE
:
4781 if (! assemble_integer (expand_expr (exp
, NULL_RTX
, VOIDmode
,
4782 EXPAND_INITIALIZER
),
4783 MIN (size
, thissize
), align
, 0))
4784 error ("initializer for integer/fixed-point value is too complicated");
4788 if (TREE_CODE (exp
) != REAL_CST
)
4789 error ("initializer for floating value is not a floating constant");
4791 assemble_real (TREE_REAL_CST (exp
), TYPE_MODE (TREE_TYPE (exp
)), align
);
4795 output_constant (TREE_REALPART (exp
), thissize
/ 2, align
);
4796 output_constant (TREE_IMAGPART (exp
), thissize
/ 2,
4797 min_align (align
, BITS_PER_UNIT
* (thissize
/ 2)));
4802 switch (TREE_CODE (exp
))
4805 return output_constructor (exp
, size
, align
, NULL
);
4808 = MIN ((unsigned HOST_WIDE_INT
)TREE_STRING_LENGTH (exp
), size
);
4809 assemble_string (TREE_STRING_POINTER (exp
), thissize
);
4813 machine_mode inner
= TYPE_MODE (TREE_TYPE (TREE_TYPE (exp
)));
4814 unsigned int nalign
= MIN (align
, GET_MODE_ALIGNMENT (inner
));
4815 int elt_size
= GET_MODE_SIZE (inner
);
4816 output_constant (VECTOR_CST_ELT (exp
, 0), elt_size
, align
);
4817 thissize
= elt_size
;
4818 for (unsigned int i
= 1; i
< VECTOR_CST_NELTS (exp
); i
++)
4820 output_constant (VECTOR_CST_ELT (exp
, i
), elt_size
, nalign
);
4821 thissize
+= elt_size
;
4832 gcc_assert (TREE_CODE (exp
) == CONSTRUCTOR
);
4833 return output_constructor (exp
, size
, align
, NULL
);
4842 if (size
> thissize
)
4843 assemble_zeros (size
- thissize
);
4849 /* Subroutine of output_constructor, used for computing the size of
4850 arrays of unspecified length. VAL must be a CONSTRUCTOR of an array
4851 type with an unspecified upper bound. */
4853 static unsigned HOST_WIDE_INT
4854 array_size_for_constructor (tree val
)
4857 unsigned HOST_WIDE_INT cnt
;
4858 tree index
, value
, tmp
;
4861 /* This code used to attempt to handle string constants that are not
4862 arrays of single-bytes, but nothing else does, so there's no point in
4864 if (TREE_CODE (val
) == STRING_CST
)
4865 return TREE_STRING_LENGTH (val
);
4867 max_index
= NULL_TREE
;
4868 FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (val
), cnt
, index
, value
)
4870 if (TREE_CODE (index
) == RANGE_EXPR
)
4871 index
= TREE_OPERAND (index
, 1);
4872 if (max_index
== NULL_TREE
|| tree_int_cst_lt (max_index
, index
))
4876 if (max_index
== NULL_TREE
)
4879 /* Compute the total number of array elements. */
4880 tmp
= TYPE_MIN_VALUE (TYPE_DOMAIN (TREE_TYPE (val
)));
4881 i
= wi::to_offset (max_index
) - wi::to_offset (tmp
) + 1;
4883 /* Multiply by the array element unit size to find number of bytes. */
4884 i
*= wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (TREE_TYPE (val
))));
4886 gcc_assert (wi::fits_uhwi_p (i
));
4887 return i
.to_uhwi ();
4890 /* Other datastructures + helpers for output_constructor. */
4892 /* output_constructor local state to support interaction with helpers. */
4896 /* Received arguments. */
4897 tree exp
; /* Constructor expression. */
4898 tree type
; /* Type of constructor expression. */
4899 unsigned HOST_WIDE_INT size
; /* # bytes to output - pad if necessary. */
4900 unsigned int align
; /* Known initial alignment. */
4901 tree min_index
; /* Lower bound if specified for an array. */
4903 /* Output processing state. */
4904 HOST_WIDE_INT total_bytes
; /* # bytes output so far / current position. */
4905 int byte
; /* Part of a bitfield byte yet to be output. */
4906 int last_relative_index
; /* Implicit or explicit index of the last
4907 array element output within a bitfield. */
4908 bool byte_buffer_in_use
; /* Whether BYTE is in use. */
4910 /* Current element. */
4911 tree field
; /* Current field decl in a record. */
4912 tree val
; /* Current element value. */
4913 tree index
; /* Current element index. */
4917 /* Helper for output_constructor. From the current LOCAL state, output a
4918 RANGE_EXPR element. */
4921 output_constructor_array_range (oc_local_state
*local
)
4923 unsigned HOST_WIDE_INT fieldsize
4924 = int_size_in_bytes (TREE_TYPE (local
->type
));
4926 HOST_WIDE_INT lo_index
4927 = tree_to_shwi (TREE_OPERAND (local
->index
, 0));
4928 HOST_WIDE_INT hi_index
4929 = tree_to_shwi (TREE_OPERAND (local
->index
, 1));
4930 HOST_WIDE_INT index
;
4933 = min_align (local
->align
, fieldsize
* BITS_PER_UNIT
);
4935 for (index
= lo_index
; index
<= hi_index
; index
++)
4937 /* Output the element's initial value. */
4938 if (local
->val
== NULL_TREE
)
4939 assemble_zeros (fieldsize
);
4941 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
4943 /* Count its size. */
4944 local
->total_bytes
+= fieldsize
;
4948 /* Helper for output_constructor. From the current LOCAL state, output a
4949 field element that is not true bitfield or part of an outer one. */
4952 output_constructor_regular_field (oc_local_state
*local
)
4954 /* Field size and position. Since this structure is static, we know the
4955 positions are constant. */
4956 unsigned HOST_WIDE_INT fieldsize
;
4957 HOST_WIDE_INT fieldpos
;
4959 unsigned int align2
;
4961 if (local
->index
!= NULL_TREE
)
4963 /* Perform the index calculation in modulo arithmetic but
4964 sign-extend the result because Ada has negative DECL_FIELD_OFFSETs
4965 but we are using an unsigned sizetype. */
4966 unsigned prec
= TYPE_PRECISION (sizetype
);
4967 offset_int idx
= wi::sext (wi::to_offset (local
->index
)
4968 - wi::to_offset (local
->min_index
), prec
);
4969 fieldpos
= (idx
* wi::to_offset (TYPE_SIZE_UNIT (TREE_TYPE (local
->val
))))
4972 else if (local
->field
!= NULL_TREE
)
4973 fieldpos
= int_byte_position (local
->field
);
4977 /* Output any buffered-up bit-fields preceding this element. */
4978 if (local
->byte_buffer_in_use
)
4980 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
4981 local
->total_bytes
++;
4982 local
->byte_buffer_in_use
= false;
4985 /* Advance to offset of this element.
4986 Note no alignment needed in an array, since that is guaranteed
4987 if each element has the proper size. */
4988 if ((local
->field
!= NULL_TREE
|| local
->index
!= NULL_TREE
)
4989 && fieldpos
> local
->total_bytes
)
4991 assemble_zeros (fieldpos
- local
->total_bytes
);
4992 local
->total_bytes
= fieldpos
;
4995 /* Find the alignment of this element. */
4996 align2
= min_align (local
->align
, BITS_PER_UNIT
* fieldpos
);
4998 /* Determine size this element should occupy. */
5003 /* If this is an array with an unspecified upper bound,
5004 the initializer determines the size. */
5005 /* ??? This ought to only checked if DECL_SIZE_UNIT is NULL,
5006 but we cannot do this until the deprecated support for
5007 initializing zero-length array members is removed. */
5008 if (TREE_CODE (TREE_TYPE (local
->field
)) == ARRAY_TYPE
5009 && TYPE_DOMAIN (TREE_TYPE (local
->field
))
5010 && ! TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (local
->field
))))
5012 fieldsize
= array_size_for_constructor (local
->val
);
5013 /* Given a non-empty initialization, this field had
5015 gcc_assert (!fieldsize
|| !DECL_CHAIN (local
->field
));
5018 fieldsize
= tree_to_uhwi (DECL_SIZE_UNIT (local
->field
));
5021 fieldsize
= int_size_in_bytes (TREE_TYPE (local
->type
));
5023 /* Output the element's initial value. */
5024 if (local
->val
== NULL_TREE
)
5025 assemble_zeros (fieldsize
);
5027 fieldsize
= output_constant (local
->val
, fieldsize
, align2
);
5029 /* Count its size. */
5030 local
->total_bytes
+= fieldsize
;
5033 /* Helper for output_constructor. From the LOCAL state, output an element
5034 that is a true bitfield or part of an outer one. BIT_OFFSET is the offset
5035 from the start of a possibly ongoing outer byte buffer. */
5038 output_constructor_bitfield (oc_local_state
*local
, unsigned int bit_offset
)
5040 /* Bit size of this element. */
5041 HOST_WIDE_INT ebitsize
5043 ? tree_to_uhwi (DECL_SIZE (local
->field
))
5044 : tree_to_uhwi (TYPE_SIZE (TREE_TYPE (local
->type
))));
5046 /* Relative index of this element if this is an array component. */
5047 HOST_WIDE_INT relative_index
5050 ? (tree_to_shwi (local
->index
)
5051 - tree_to_shwi (local
->min_index
))
5052 : local
->last_relative_index
+ 1)
5055 /* Bit position of this element from the start of the containing
5057 HOST_WIDE_INT constructor_relative_ebitpos
5059 ? int_bit_position (local
->field
)
5060 : ebitsize
* relative_index
);
5062 /* Bit position of this element from the start of a possibly ongoing
5063 outer byte buffer. */
5064 HOST_WIDE_INT byte_relative_ebitpos
5065 = bit_offset
+ constructor_relative_ebitpos
;
5067 /* From the start of a possibly ongoing outer byte buffer, offsets to
5068 the first bit of this element and to the first bit past the end of
5070 HOST_WIDE_INT next_offset
= byte_relative_ebitpos
;
5071 HOST_WIDE_INT end_offset
= byte_relative_ebitpos
+ ebitsize
;
5073 local
->last_relative_index
= relative_index
;
5075 if (local
->val
== NULL_TREE
)
5076 local
->val
= integer_zero_node
;
5078 while (TREE_CODE (local
->val
) == VIEW_CONVERT_EXPR
5079 || TREE_CODE (local
->val
) == NON_LVALUE_EXPR
)
5080 local
->val
= TREE_OPERAND (local
->val
, 0);
5082 if (TREE_CODE (local
->val
) != INTEGER_CST
5083 && TREE_CODE (local
->val
) != CONSTRUCTOR
)
5085 error ("invalid initial value for member %qE", DECL_NAME (local
->field
));
5089 /* If this field does not start in this (or next) byte, skip some bytes. */
5090 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5092 /* Output remnant of any bit field in previous bytes. */
5093 if (local
->byte_buffer_in_use
)
5095 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5096 local
->total_bytes
++;
5097 local
->byte_buffer_in_use
= false;
5100 /* If still not at proper byte, advance to there. */
5101 if (next_offset
/ BITS_PER_UNIT
!= local
->total_bytes
)
5103 gcc_assert (next_offset
/ BITS_PER_UNIT
>= local
->total_bytes
);
5104 assemble_zeros (next_offset
/ BITS_PER_UNIT
- local
->total_bytes
);
5105 local
->total_bytes
= next_offset
/ BITS_PER_UNIT
;
5109 /* Set up the buffer if necessary. */
5110 if (!local
->byte_buffer_in_use
)
5114 local
->byte_buffer_in_use
= true;
5117 /* If this is nested constructor, recurse passing the bit offset and the
5118 pending data, then retrieve the new pending data afterwards. */
5119 if (TREE_CODE (local
->val
) == CONSTRUCTOR
)
5121 oc_outer_state temp_state
;
5122 temp_state
.bit_offset
= next_offset
% BITS_PER_UNIT
;
5123 temp_state
.byte
= local
->byte
;
5125 += output_constructor (local
->val
, 0, 0, &temp_state
);
5126 local
->byte
= temp_state
.byte
;
5130 /* Otherwise, we must split the element into pieces that fall within
5131 separate bytes, and combine each byte with previous or following
5133 while (next_offset
< end_offset
)
5137 HOST_WIDE_INT value
;
5138 HOST_WIDE_INT next_byte
= next_offset
/ BITS_PER_UNIT
;
5139 HOST_WIDE_INT next_bit
= next_offset
% BITS_PER_UNIT
;
5141 /* Advance from byte to byte within this element when necessary. */
5142 while (next_byte
!= local
->total_bytes
)
5144 assemble_integer (GEN_INT (local
->byte
), 1, BITS_PER_UNIT
, 1);
5145 local
->total_bytes
++;
5149 /* Number of bits we can process at once (all part of the same byte). */
5150 this_time
= MIN (end_offset
- next_offset
, BITS_PER_UNIT
- next_bit
);
5151 if (BYTES_BIG_ENDIAN
)
5153 /* On big-endian machine, take the most significant bits (of the
5154 bits that are significant) first and put them into bytes from
5155 the most significant end. */
5156 shift
= end_offset
- next_offset
- this_time
;
5158 /* Don't try to take a bunch of bits that cross
5159 the word boundary in the INTEGER_CST. We can
5160 only select bits from one element. */
5161 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5162 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5164 const int end
= shift
+ this_time
- 1;
5165 shift
= end
& -HOST_BITS_PER_WIDE_INT
;
5166 this_time
= end
- shift
+ 1;
5169 /* Now get the bits from the appropriate constant word. */
5170 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5171 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5173 /* Get the result. This works only when:
5174 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5175 local
->byte
|= (((value
>> shift
)
5176 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5177 << (BITS_PER_UNIT
- this_time
- next_bit
));
5181 /* On little-endian machines, take the least significant bits of
5182 the value first and pack them starting at the least significant
5183 bits of the bytes. */
5184 shift
= next_offset
- byte_relative_ebitpos
;
5186 /* Don't try to take a bunch of bits that cross
5187 the word boundary in the INTEGER_CST. We can
5188 only select bits from one element. */
5189 if ((shift
/ HOST_BITS_PER_WIDE_INT
)
5190 != ((shift
+ this_time
- 1) / HOST_BITS_PER_WIDE_INT
))
5192 = HOST_BITS_PER_WIDE_INT
- (shift
& (HOST_BITS_PER_WIDE_INT
- 1));
5194 /* Now get the bits from the appropriate constant word. */
5195 value
= TREE_INT_CST_ELT (local
->val
, shift
/ HOST_BITS_PER_WIDE_INT
);
5196 shift
= shift
& (HOST_BITS_PER_WIDE_INT
- 1);
5198 /* Get the result. This works only when:
5199 1 <= this_time <= HOST_BITS_PER_WIDE_INT. */
5200 local
->byte
|= (((value
>> shift
)
5201 & (((HOST_WIDE_INT
) 2 << (this_time
- 1)) - 1))
5205 next_offset
+= this_time
;
5206 local
->byte_buffer_in_use
= true;
5210 /* Subroutine of output_constant, used for CONSTRUCTORs (aggregate constants).
5211 Generate at least SIZE bytes, padding if necessary. OUTER designates the
5212 caller output state of relevance in recursive invocations. */
5214 static unsigned HOST_WIDE_INT
5215 output_constructor (tree exp
, unsigned HOST_WIDE_INT size
,
5216 unsigned int align
, oc_outer_state
*outer
)
5218 unsigned HOST_WIDE_INT cnt
;
5219 constructor_elt
*ce
;
5221 oc_local_state local
;
5223 /* Setup our local state to communicate with helpers. */
5225 local
.type
= TREE_TYPE (exp
);
5227 local
.align
= align
;
5228 if (TREE_CODE (local
.type
) == ARRAY_TYPE
&& TYPE_DOMAIN (local
.type
))
5229 local
.min_index
= TYPE_MIN_VALUE (TYPE_DOMAIN (local
.type
));
5231 local
.min_index
= NULL_TREE
;
5233 local
.total_bytes
= 0;
5234 local
.byte_buffer_in_use
= outer
!= NULL
;
5235 local
.byte
= outer
? outer
->byte
: 0;
5236 local
.last_relative_index
= -1;
5238 gcc_assert (HOST_BITS_PER_WIDE_INT
>= BITS_PER_UNIT
);
5240 /* As CE goes through the elements of the constant, FIELD goes through the
5241 structure fields if the constant is a structure. If the constant is a
5242 union, we override this by getting the field from the TREE_LIST element.
5243 But the constant could also be an array. Then FIELD is zero.
5245 There is always a maximum of one element in the chain LINK for unions
5246 (even if the initializer in a source program incorrectly contains
5249 if (TREE_CODE (local
.type
) == RECORD_TYPE
)
5250 local
.field
= TYPE_FIELDS (local
.type
);
5252 local
.field
= NULL_TREE
;
5255 vec_safe_iterate (CONSTRUCTOR_ELTS (exp
), cnt
, &ce
);
5256 cnt
++, local
.field
= local
.field
? DECL_CHAIN (local
.field
) : 0)
5258 local
.val
= ce
->value
;
5259 local
.index
= NULL_TREE
;
5261 /* The element in a union constructor specifies the proper field
5263 if (RECORD_OR_UNION_TYPE_P (local
.type
) && ce
->index
!= NULL_TREE
)
5264 local
.field
= ce
->index
;
5266 else if (TREE_CODE (local
.type
) == ARRAY_TYPE
)
5267 local
.index
= ce
->index
;
5269 if (local
.field
&& flag_verbose_asm
)
5270 fprintf (asm_out_file
, "%s %s:\n",
5272 DECL_NAME (local
.field
)
5273 ? IDENTIFIER_POINTER (DECL_NAME (local
.field
))
5276 /* Eliminate the marker that makes a cast not be an lvalue. */
5277 if (local
.val
!= NULL_TREE
)
5278 STRIP_NOPS (local
.val
);
5280 /* Output the current element, using the appropriate helper ... */
5282 /* For an array slice not part of an outer bitfield. */
5284 && local
.index
!= NULL_TREE
5285 && TREE_CODE (local
.index
) == RANGE_EXPR
)
5286 output_constructor_array_range (&local
);
5288 /* For a field that is neither a true bitfield nor part of an outer one,
5289 known to be at least byte aligned and multiple-of-bytes long. */
5291 && (local
.field
== NULL_TREE
5292 || !CONSTRUCTOR_BITFIELD_P (local
.field
)))
5293 output_constructor_regular_field (&local
);
5295 /* For a true bitfield or part of an outer one. Only INTEGER_CSTs are
5296 supported for scalar fields, so we may need to convert first. */
5299 if (TREE_CODE (local
.val
) == REAL_CST
)
5301 = fold_unary (VIEW_CONVERT_EXPR
,
5302 build_nonstandard_integer_type
5303 (TYPE_PRECISION (TREE_TYPE (local
.val
)), 0),
5305 output_constructor_bitfield (&local
, outer
? outer
->bit_offset
: 0);
5309 /* If we are not at toplevel, save the pending data for our caller.
5310 Otherwise output the pending data and padding zeros as needed. */
5312 outer
->byte
= local
.byte
;
5315 if (local
.byte_buffer_in_use
)
5317 assemble_integer (GEN_INT (local
.byte
), 1, BITS_PER_UNIT
, 1);
5318 local
.total_bytes
++;
5321 if ((unsigned HOST_WIDE_INT
)local
.total_bytes
< local
.size
)
5323 assemble_zeros (local
.size
- local
.total_bytes
);
5324 local
.total_bytes
= local
.size
;
5328 return local
.total_bytes
;
5331 /* Mark DECL as weak. */
5334 mark_weak (tree decl
)
5336 if (DECL_WEAK (decl
))
5339 struct symtab_node
*n
= symtab_node::get (decl
);
5340 if (n
&& n
->refuse_visibility_changes
)
5341 error ("%+D declared weak after being used", decl
);
5342 DECL_WEAK (decl
) = 1;
5344 if (DECL_RTL_SET_P (decl
)
5345 && MEM_P (DECL_RTL (decl
))
5346 && XEXP (DECL_RTL (decl
), 0)
5347 && GET_CODE (XEXP (DECL_RTL (decl
), 0)) == SYMBOL_REF
)
5348 SYMBOL_REF_WEAK (XEXP (DECL_RTL (decl
), 0)) = 1;
5351 /* Merge weak status between NEWDECL and OLDDECL. */
5354 merge_weak (tree newdecl
, tree olddecl
)
5356 if (DECL_WEAK (newdecl
) == DECL_WEAK (olddecl
))
5358 if (DECL_WEAK (newdecl
) && TARGET_SUPPORTS_WEAK
)
5361 /* We put the NEWDECL on the weak_decls list at some point
5362 and OLDDECL as well. Keep just OLDDECL on the list. */
5363 for (pwd
= &weak_decls
; *pwd
; pwd
= &TREE_CHAIN (*pwd
))
5364 if (TREE_VALUE (*pwd
) == newdecl
)
5366 *pwd
= TREE_CHAIN (*pwd
);
5373 if (DECL_WEAK (newdecl
))
5377 /* NEWDECL is weak, but OLDDECL is not. */
5379 /* If we already output the OLDDECL, we're in trouble; we can't
5380 go back and make it weak. This should never happen in
5381 unit-at-a-time compilation. */
5382 gcc_assert (!TREE_ASM_WRITTEN (olddecl
));
5384 /* If we've already generated rtl referencing OLDDECL, we may
5385 have done so in a way that will not function properly with
5386 a weak symbol. Again in unit-at-a-time this should be
5388 gcc_assert (!TREE_USED (olddecl
)
5389 || !TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (olddecl
)));
5391 if (TARGET_SUPPORTS_WEAK
)
5393 /* We put the NEWDECL on the weak_decls list at some point.
5394 Replace it with the OLDDECL. */
5395 for (wd
= weak_decls
; wd
; wd
= TREE_CHAIN (wd
))
5396 if (TREE_VALUE (wd
) == newdecl
)
5398 TREE_VALUE (wd
) = olddecl
;
5401 /* We may not find the entry on the list. If NEWDECL is a
5402 weak alias, then we will have already called
5403 globalize_decl to remove the entry; in that case, we do
5404 not need to do anything. */
5407 /* Make the OLDDECL weak; it's OLDDECL that we'll be keeping. */
5408 mark_weak (olddecl
);
5411 /* OLDDECL was weak, but NEWDECL was not explicitly marked as
5412 weak. Just update NEWDECL to indicate that it's weak too. */
5413 mark_weak (newdecl
);
5416 /* Declare DECL to be a weak symbol. */
5419 declare_weak (tree decl
)
5421 gcc_assert (TREE_CODE (decl
) != FUNCTION_DECL
|| !TREE_ASM_WRITTEN (decl
));
5422 if (! TREE_PUBLIC (decl
))
5423 error ("weak declaration of %q+D must be public", decl
);
5424 else if (!TARGET_SUPPORTS_WEAK
)
5425 warning (0, "weak declaration of %q+D not supported", decl
);
5428 if (!lookup_attribute ("weak", DECL_ATTRIBUTES (decl
)))
5429 DECL_ATTRIBUTES (decl
)
5430 = tree_cons (get_identifier ("weak"), NULL
, DECL_ATTRIBUTES (decl
));
5434 weak_finish_1 (tree decl
)
5436 #if defined (ASM_WEAKEN_DECL) || defined (ASM_WEAKEN_LABEL)
5437 const char *const name
= IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl
));
5440 if (! TREE_USED (decl
))
5443 #ifdef ASM_WEAKEN_DECL
5444 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, NULL
);
5446 #ifdef ASM_WEAKEN_LABEL
5447 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5449 #ifdef ASM_OUTPUT_WEAK_ALIAS
5451 static bool warn_once
= 0;
5454 warning (0, "only weak aliases are supported in this configuration");
5464 /* Fiven an assembly name, find the decl it is associated with. */
5466 find_decl (tree target
)
5468 symtab_node
*node
= symtab_node::get_for_asmname (target
);
5474 /* This TREE_LIST contains weakref targets. */
5476 static GTY(()) tree weakref_targets
;
5478 /* Emit any pending weak declarations. */
5485 for (t
= weakref_targets
; t
; t
= TREE_CHAIN (t
))
5487 tree alias_decl
= TREE_PURPOSE (t
);
5488 tree target
= ultimate_transparent_alias_target (&TREE_VALUE (t
));
5490 if (! TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (alias_decl
)))
5491 /* Remove alias_decl from the weak list, but leave entries for
5492 the target alone. */
5494 #ifndef ASM_OUTPUT_WEAKREF
5495 else if (! TREE_SYMBOL_REFERENCED (target
))
5497 /* Use ASM_WEAKEN_LABEL only if ASM_WEAKEN_DECL is not
5498 defined, otherwise we and weak_finish_1 would use
5499 different macros. */
5500 # if defined ASM_WEAKEN_LABEL && ! defined ASM_WEAKEN_DECL
5501 ASM_WEAKEN_LABEL (asm_out_file
, IDENTIFIER_POINTER (target
));
5503 tree decl
= find_decl (target
);
5507 decl
= build_decl (DECL_SOURCE_LOCATION (alias_decl
),
5508 TREE_CODE (alias_decl
), target
,
5509 TREE_TYPE (alias_decl
));
5511 DECL_EXTERNAL (decl
) = 1;
5512 TREE_PUBLIC (decl
) = 1;
5513 DECL_ARTIFICIAL (decl
) = 1;
5514 TREE_NOTHROW (decl
) = TREE_NOTHROW (alias_decl
);
5515 TREE_USED (decl
) = 1;
5518 weak_finish_1 (decl
);
5527 /* Remove the alias and the target from the pending weak list
5528 so that we do not emit any .weak directives for the former,
5529 nor multiple .weak directives for the latter. */
5530 for (p
= &weak_decls
; (t2
= *p
) ; )
5532 if (TREE_VALUE (t2
) == alias_decl
5533 || target
== DECL_ASSEMBLER_NAME (TREE_VALUE (t2
)))
5534 *p
= TREE_CHAIN (t2
);
5536 p
= &TREE_CHAIN (t2
);
5539 /* Remove other weakrefs to the same target, to speed things up. */
5540 for (p
= &TREE_CHAIN (t
); (t2
= *p
) ; )
5542 if (target
== ultimate_transparent_alias_target (&TREE_VALUE (t2
)))
5543 *p
= TREE_CHAIN (t2
);
5545 p
= &TREE_CHAIN (t2
);
5550 for (t
= weak_decls
; t
; t
= TREE_CHAIN (t
))
5552 tree decl
= TREE_VALUE (t
);
5554 weak_finish_1 (decl
);
5558 /* Emit the assembly bits to indicate that DECL is globally visible. */
5561 globalize_decl (tree decl
)
5564 #if defined (ASM_WEAKEN_LABEL) || defined (ASM_WEAKEN_DECL)
5565 if (DECL_WEAK (decl
))
5567 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
5570 #ifdef ASM_WEAKEN_DECL
5571 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, 0);
5573 ASM_WEAKEN_LABEL (asm_out_file
, name
);
5576 /* Remove this function from the pending weak list so that
5577 we do not emit multiple .weak directives for it. */
5578 for (p
= &weak_decls
; (t
= *p
) ; )
5580 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5581 *p
= TREE_CHAIN (t
);
5583 p
= &TREE_CHAIN (t
);
5586 /* Remove weakrefs to the same target from the pending weakref
5587 list, for the same reason. */
5588 for (p
= &weakref_targets
; (t
= *p
) ; )
5590 if (DECL_ASSEMBLER_NAME (decl
)
5591 == ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5592 *p
= TREE_CHAIN (t
);
5594 p
= &TREE_CHAIN (t
);
5601 targetm
.asm_out
.globalize_decl_name (asm_out_file
, decl
);
5604 vec
<alias_pair
, va_gc
> *alias_pairs
;
5606 /* Output the assembler code for a define (equate) using ASM_OUTPUT_DEF
5607 or ASM_OUTPUT_DEF_FROM_DECLS. The function defines the symbol whose
5608 tree node is DECL to have the value of the tree node TARGET. */
5611 do_assemble_alias (tree decl
, tree target
)
5615 /* Emulated TLS had better not get this var. */
5616 gcc_assert (!(!targetm
.have_tls
5617 && TREE_CODE (decl
) == VAR_DECL
5618 && DECL_THREAD_LOCAL_P (decl
)));
5620 if (TREE_ASM_WRITTEN (decl
))
5623 id
= DECL_ASSEMBLER_NAME (decl
);
5624 ultimate_transparent_alias_target (&id
);
5625 ultimate_transparent_alias_target (&target
);
5627 /* We must force creation of DECL_RTL for debug info generation, even though
5628 we don't use it here. */
5629 make_decl_rtl (decl
);
5631 TREE_ASM_WRITTEN (decl
) = 1;
5632 TREE_ASM_WRITTEN (DECL_ASSEMBLER_NAME (decl
)) = 1;
5633 TREE_ASM_WRITTEN (id
) = 1;
5635 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5637 if (!TREE_SYMBOL_REFERENCED (target
))
5638 weakref_targets
= tree_cons (decl
, target
, weakref_targets
);
5640 #ifdef ASM_OUTPUT_WEAKREF
5641 ASM_OUTPUT_WEAKREF (asm_out_file
, decl
,
5642 IDENTIFIER_POINTER (id
),
5643 IDENTIFIER_POINTER (target
));
5645 if (!TARGET_SUPPORTS_WEAK
)
5647 error_at (DECL_SOURCE_LOCATION (decl
),
5648 "weakref is not supported in this configuration");
5655 #ifdef ASM_OUTPUT_DEF
5656 tree orig_decl
= decl
;
5658 if (TREE_CODE (decl
) == FUNCTION_DECL
5659 && cgraph_node::get (decl
)->instrumentation_clone
5660 && cgraph_node::get (decl
)->instrumented_version
)
5661 orig_decl
= cgraph_node::get (decl
)->instrumented_version
->decl
;
5663 /* Make name accessible from other files, if appropriate. */
5665 if (TREE_PUBLIC (decl
) || TREE_PUBLIC (orig_decl
))
5667 globalize_decl (decl
);
5668 maybe_assemble_visibility (decl
);
5670 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5672 #if defined (ASM_OUTPUT_TYPE_DIRECTIVE)
5673 if (targetm
.has_ifunc_p ())
5674 ASM_OUTPUT_TYPE_DIRECTIVE
5675 (asm_out_file
, IDENTIFIER_POINTER (id
),
5679 error_at (DECL_SOURCE_LOCATION (decl
),
5680 "ifunc is not supported on this target");
5683 # ifdef ASM_OUTPUT_DEF_FROM_DECLS
5684 ASM_OUTPUT_DEF_FROM_DECLS (asm_out_file
, decl
, target
);
5686 ASM_OUTPUT_DEF (asm_out_file
,
5687 IDENTIFIER_POINTER (id
),
5688 IDENTIFIER_POINTER (target
));
5690 #elif defined (ASM_OUTPUT_WEAK_ALIAS) || defined (ASM_WEAKEN_DECL)
5695 name
= IDENTIFIER_POINTER (id
);
5696 # ifdef ASM_WEAKEN_DECL
5697 ASM_WEAKEN_DECL (asm_out_file
, decl
, name
, IDENTIFIER_POINTER (target
));
5699 ASM_OUTPUT_WEAK_ALIAS (asm_out_file
, name
, IDENTIFIER_POINTER (target
));
5701 /* Remove this function from the pending weak list so that
5702 we do not emit multiple .weak directives for it. */
5703 for (p
= &weak_decls
; (t
= *p
) ; )
5704 if (DECL_ASSEMBLER_NAME (decl
) == DECL_ASSEMBLER_NAME (TREE_VALUE (t
))
5705 || id
== DECL_ASSEMBLER_NAME (TREE_VALUE (t
)))
5706 *p
= TREE_CHAIN (t
);
5708 p
= &TREE_CHAIN (t
);
5710 /* Remove weakrefs to the same target from the pending weakref
5711 list, for the same reason. */
5712 for (p
= &weakref_targets
; (t
= *p
) ; )
5714 if (id
== ultimate_transparent_alias_target (&TREE_VALUE (t
)))
5715 *p
= TREE_CHAIN (t
);
5717 p
= &TREE_CHAIN (t
);
5723 /* Emit an assembler directive to make the symbol for DECL an alias to
5724 the symbol for TARGET. */
5727 assemble_alias (tree decl
, tree target
)
5731 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (decl
)))
5733 tree alias
= DECL_ASSEMBLER_NAME (decl
);
5735 ultimate_transparent_alias_target (&target
);
5737 if (alias
== target
)
5738 error ("weakref %q+D ultimately targets itself", decl
);
5739 if (TREE_PUBLIC (decl
))
5740 error ("weakref %q+D must have static linkage", decl
);
5744 #if !defined (ASM_OUTPUT_DEF)
5745 # if !defined(ASM_OUTPUT_WEAK_ALIAS) && !defined (ASM_WEAKEN_DECL)
5746 error_at (DECL_SOURCE_LOCATION (decl
),
5747 "alias definitions not supported in this configuration");
5748 TREE_ASM_WRITTEN (decl
) = 1;
5751 if (!DECL_WEAK (decl
))
5753 if (lookup_attribute ("ifunc", DECL_ATTRIBUTES (decl
)))
5754 error_at (DECL_SOURCE_LOCATION (decl
),
5755 "ifunc is not supported in this configuration");
5757 error_at (DECL_SOURCE_LOCATION (decl
),
5758 "only weak aliases are supported in this configuration");
5759 TREE_ASM_WRITTEN (decl
) = 1;
5765 TREE_USED (decl
) = 1;
5767 /* Allow aliases to aliases. */
5768 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5769 cgraph_node::get_create (decl
)->alias
= true;
5771 varpool_node::get_create (decl
)->alias
= true;
5773 /* If the target has already been emitted, we don't have to queue the
5774 alias. This saves a tad of memory. */
5775 if (symtab
->global_info_ready
)
5776 target_decl
= find_decl (target
);
5779 if ((target_decl
&& TREE_ASM_WRITTEN (target_decl
))
5780 || symtab
->state
>= EXPANSION
)
5781 do_assemble_alias (decl
, target
);
5784 alias_pair p
= {decl
, target
};
5785 vec_safe_push (alias_pairs
, p
);
5789 /* Record and output a table of translations from original function
5790 to its transaction aware clone. Note that tm_pure functions are
5791 considered to be their own clone. */
5793 struct tm_clone_hasher
: ggc_cache_hasher
<tree_map
*>
5795 static hashval_t
hash (tree_map
*m
) { return tree_map_hash (m
); }
5796 static bool equal (tree_map
*a
, tree_map
*b
) { return tree_map_eq (a
, b
); }
5799 keep_cache_entry (tree_map
*&e
)
5801 return ggc_marked_p (e
->base
.from
);
5805 static GTY((cache
)) hash_table
<tm_clone_hasher
> *tm_clone_hash
;
5808 record_tm_clone_pair (tree o
, tree n
)
5810 struct tree_map
**slot
, *h
;
5812 if (tm_clone_hash
== NULL
)
5813 tm_clone_hash
= hash_table
<tm_clone_hasher
>::create_ggc (32);
5815 h
= ggc_alloc
<tree_map
> ();
5816 h
->hash
= htab_hash_pointer (o
);
5820 slot
= tm_clone_hash
->find_slot_with_hash (h
, h
->hash
, INSERT
);
5825 get_tm_clone_pair (tree o
)
5829 struct tree_map
*h
, in
;
5832 in
.hash
= htab_hash_pointer (o
);
5833 h
= tm_clone_hash
->find_with_hash (&in
, in
.hash
);
5840 typedef struct tm_alias_pair
5848 /* Dump the actual pairs to the .tm_clone_table section. */
5851 dump_tm_clone_pairs (vec
<tm_alias_pair
> tm_alias_pairs
)
5855 bool switched
= false;
5857 FOR_EACH_VEC_ELT (tm_alias_pairs
, i
, p
)
5861 struct cgraph_node
*src_n
= cgraph_node::get (src
);
5862 struct cgraph_node
*dst_n
= cgraph_node::get (dst
);
5864 /* The function ipa_tm_create_version() marks the clone as needed if
5865 the original function was needed. But we also mark the clone as
5866 needed if we ever called the clone indirectly through
5867 TM_GETTMCLONE. If neither of these are true, we didn't generate
5868 a clone, and we didn't call it indirectly... no sense keeping it
5869 in the clone table. */
5870 if (!dst_n
|| !dst_n
->definition
)
5873 /* This covers the case where we have optimized the original
5874 function away, and only access the transactional clone. */
5875 if (!src_n
|| !src_n
->definition
)
5880 switch_to_section (targetm
.asm_out
.tm_clone_table_section ());
5881 assemble_align (POINTER_SIZE
);
5885 assemble_integer (XEXP (DECL_RTL (src
), 0),
5886 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5887 assemble_integer (XEXP (DECL_RTL (dst
), 0),
5888 POINTER_SIZE_UNITS
, POINTER_SIZE
, 1);
5892 /* Provide a default for the tm_clone_table section. */
5895 default_clone_table_section (void)
5897 return get_named_section (NULL
, ".tm_clone_table", 3);
5900 /* Helper comparison function for qsorting by the DECL_UID stored in
5901 alias_pair->emitted_diags. */
5904 tm_alias_pair_cmp (const void *x
, const void *y
)
5906 const tm_alias_pair
*p1
= (const tm_alias_pair
*) x
;
5907 const tm_alias_pair
*p2
= (const tm_alias_pair
*) y
;
5908 if (p1
->uid
< p2
->uid
)
5910 if (p1
->uid
> p2
->uid
)
5916 finish_tm_clone_pairs (void)
5918 vec
<tm_alias_pair
> tm_alias_pairs
= vNULL
;
5920 if (tm_clone_hash
== NULL
)
5923 /* We need a determenistic order for the .tm_clone_table, otherwise
5924 we will get bootstrap comparison failures, so dump the hash table
5925 to a vector, sort it, and dump the vector. */
5927 /* Dump the hashtable to a vector. */
5929 hash_table
<tm_clone_hasher
>::iterator iter
;
5930 FOR_EACH_HASH_TABLE_ELEMENT (*tm_clone_hash
, map
, tree_map
*, iter
)
5932 tm_alias_pair p
= {DECL_UID (map
->base
.from
), map
->base
.from
, map
->to
};
5933 tm_alias_pairs
.safe_push (p
);
5936 tm_alias_pairs
.qsort (tm_alias_pair_cmp
);
5939 dump_tm_clone_pairs (tm_alias_pairs
);
5941 tm_clone_hash
->empty ();
5942 tm_clone_hash
= NULL
;
5943 tm_alias_pairs
.release ();
5947 /* Emit an assembler directive to set symbol for DECL visibility to
5948 the visibility type VIS, which must not be VISIBILITY_DEFAULT. */
5951 default_assemble_visibility (tree decl ATTRIBUTE_UNUSED
,
5952 int vis ATTRIBUTE_UNUSED
)
5954 #ifdef HAVE_GAS_HIDDEN
5955 static const char * const visibility_types
[] = {
5956 NULL
, "protected", "hidden", "internal"
5959 const char *name
, *type
;
5962 id
= DECL_ASSEMBLER_NAME (decl
);
5963 ultimate_transparent_alias_target (&id
);
5964 name
= IDENTIFIER_POINTER (id
);
5966 type
= visibility_types
[vis
];
5968 fprintf (asm_out_file
, "\t.%s\t", type
);
5969 assemble_name (asm_out_file
, name
);
5970 fprintf (asm_out_file
, "\n");
5972 if (!DECL_ARTIFICIAL (decl
))
5973 warning (OPT_Wattributes
, "visibility attribute not supported "
5974 "in this configuration; ignored");
5978 /* A helper function to call assemble_visibility when needed for a decl. */
5981 maybe_assemble_visibility (tree decl
)
5983 enum symbol_visibility vis
= DECL_VISIBILITY (decl
);
5985 if (TREE_CODE (decl
) == FUNCTION_DECL
5986 && cgraph_node::get (decl
)
5987 && cgraph_node::get (decl
)->instrumentation_clone
5988 && cgraph_node::get (decl
)->instrumented_version
)
5989 vis
= DECL_VISIBILITY (cgraph_node::get (decl
)->instrumented_version
->decl
);
5991 if (vis
!= VISIBILITY_DEFAULT
)
5993 targetm
.asm_out
.assemble_visibility (decl
, vis
);
6000 /* Returns 1 if the target configuration supports defining public symbols
6001 so that one of them will be chosen at link time instead of generating a
6002 multiply-defined symbol error, whether through the use of weak symbols or
6003 a target-specific mechanism for having duplicates discarded. */
6006 supports_one_only (void)
6008 if (SUPPORTS_ONE_ONLY
)
6010 return TARGET_SUPPORTS_WEAK
;
6013 /* Set up DECL as a public symbol that can be defined in multiple
6014 translation units without generating a linker error. */
6017 make_decl_one_only (tree decl
, tree comdat_group
)
6019 struct symtab_node
*symbol
;
6020 gcc_assert (TREE_CODE (decl
) == VAR_DECL
6021 || TREE_CODE (decl
) == FUNCTION_DECL
);
6023 TREE_PUBLIC (decl
) = 1;
6025 if (TREE_CODE (decl
) == VAR_DECL
)
6026 symbol
= varpool_node::get_create (decl
);
6028 symbol
= cgraph_node::get_create (decl
);
6030 if (SUPPORTS_ONE_ONLY
)
6032 #ifdef MAKE_DECL_ONE_ONLY
6033 MAKE_DECL_ONE_ONLY (decl
);
6035 symbol
->set_comdat_group (comdat_group
);
6037 else if (TREE_CODE (decl
) == VAR_DECL
6038 && (DECL_INITIAL (decl
) == 0
6039 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6040 DECL_COMMON (decl
) = 1;
6043 gcc_assert (TARGET_SUPPORTS_WEAK
);
6044 DECL_WEAK (decl
) = 1;
6049 init_varasm_once (void)
6051 section_htab
= hash_table
<section_hasher
>::create_ggc (31);
6052 object_block_htab
= hash_table
<object_block_hasher
>::create_ggc (31);
6053 const_desc_htab
= hash_table
<tree_descriptor_hasher
>::create_ggc (1009);
6055 shared_constant_pool
= create_constant_pool ();
6057 #ifdef TEXT_SECTION_ASM_OP
6058 text_section
= get_unnamed_section (SECTION_CODE
, output_section_asm_op
,
6059 TEXT_SECTION_ASM_OP
);
6062 #ifdef DATA_SECTION_ASM_OP
6063 data_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6064 DATA_SECTION_ASM_OP
);
6067 #ifdef SDATA_SECTION_ASM_OP
6068 sdata_section
= get_unnamed_section (SECTION_WRITE
, output_section_asm_op
,
6069 SDATA_SECTION_ASM_OP
);
6072 #ifdef READONLY_DATA_SECTION_ASM_OP
6073 readonly_data_section
= get_unnamed_section (0, output_section_asm_op
,
6074 READONLY_DATA_SECTION_ASM_OP
);
6077 #ifdef CTORS_SECTION_ASM_OP
6078 ctors_section
= get_unnamed_section (0, output_section_asm_op
,
6079 CTORS_SECTION_ASM_OP
);
6082 #ifdef DTORS_SECTION_ASM_OP
6083 dtors_section
= get_unnamed_section (0, output_section_asm_op
,
6084 DTORS_SECTION_ASM_OP
);
6087 #ifdef BSS_SECTION_ASM_OP
6088 bss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6089 output_section_asm_op
,
6090 BSS_SECTION_ASM_OP
);
6093 #ifdef SBSS_SECTION_ASM_OP
6094 sbss_section
= get_unnamed_section (SECTION_WRITE
| SECTION_BSS
,
6095 output_section_asm_op
,
6096 SBSS_SECTION_ASM_OP
);
6099 tls_comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6100 | SECTION_COMMON
, emit_tls_common
);
6101 lcomm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6102 | SECTION_COMMON
, emit_local
);
6103 comm_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
6104 | SECTION_COMMON
, emit_common
);
6106 #if defined ASM_OUTPUT_ALIGNED_BSS
6107 bss_noswitch_section
= get_noswitch_section (SECTION_WRITE
| SECTION_BSS
,
6111 targetm
.asm_out
.init_sections ();
6113 if (readonly_data_section
== NULL
)
6114 readonly_data_section
= text_section
;
6116 #ifdef ASM_OUTPUT_EXTERNAL
6117 pending_assemble_externals_set
= new hash_set
<tree
>;
6122 decl_default_tls_model (const_tree decl
)
6124 enum tls_model kind
;
6127 is_local
= targetm
.binds_local_p (decl
);
6131 kind
= TLS_MODEL_LOCAL_EXEC
;
6133 kind
= TLS_MODEL_INITIAL_EXEC
;
6136 /* Local dynamic is inefficient when we're not combining the
6137 parts of the address. */
6138 else if (optimize
&& is_local
)
6139 kind
= TLS_MODEL_LOCAL_DYNAMIC
;
6141 kind
= TLS_MODEL_GLOBAL_DYNAMIC
;
6142 if (kind
< flag_tls_default
)
6143 kind
= flag_tls_default
;
6148 /* Select a set of attributes for section NAME based on the properties
6149 of DECL and whether or not RELOC indicates that DECL's initializer
6150 might contain runtime relocations.
6152 We make the section read-only and executable for a function decl,
6153 read-only for a const data decl, and writable for a non-const data decl. */
6156 default_section_type_flags (tree decl
, const char *name
, int reloc
)
6160 if (decl
&& TREE_CODE (decl
) == FUNCTION_DECL
)
6161 flags
= SECTION_CODE
;
6164 enum section_category category
6165 = categorize_decl_for_section (decl
, reloc
);
6166 if (decl_readonly_section_1 (category
))
6168 else if (category
== SECCAT_DATA_REL_RO
6169 || category
== SECCAT_DATA_REL_RO_LOCAL
)
6170 flags
= SECTION_WRITE
| SECTION_RELRO
;
6172 flags
= SECTION_WRITE
;
6176 flags
= SECTION_WRITE
;
6177 if (strcmp (name
, ".data.rel.ro") == 0
6178 || strcmp (name
, ".data.rel.ro.local") == 0)
6179 flags
|= SECTION_RELRO
;
6182 if (decl
&& DECL_P (decl
) && DECL_COMDAT_GROUP (decl
))
6183 flags
|= SECTION_LINKONCE
;
6185 if (strcmp (name
, ".vtable_map_vars") == 0)
6186 flags
|= SECTION_LINKONCE
;
6188 if (decl
&& TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6189 flags
|= SECTION_TLS
| SECTION_WRITE
;
6191 if (strcmp (name
, ".bss") == 0
6192 || strncmp (name
, ".bss.", 5) == 0
6193 || strncmp (name
, ".gnu.linkonce.b.", 16) == 0
6194 || strcmp (name
, ".persistent.bss") == 0
6195 || strcmp (name
, ".sbss") == 0
6196 || strncmp (name
, ".sbss.", 6) == 0
6197 || strncmp (name
, ".gnu.linkonce.sb.", 17) == 0)
6198 flags
|= SECTION_BSS
;
6200 if (strcmp (name
, ".tdata") == 0
6201 || strncmp (name
, ".tdata.", 7) == 0
6202 || strncmp (name
, ".gnu.linkonce.td.", 17) == 0)
6203 flags
|= SECTION_TLS
;
6205 if (strcmp (name
, ".tbss") == 0
6206 || strncmp (name
, ".tbss.", 6) == 0
6207 || strncmp (name
, ".gnu.linkonce.tb.", 17) == 0)
6208 flags
|= SECTION_TLS
| SECTION_BSS
;
6210 /* These three sections have special ELF types. They are neither
6211 SHT_PROGBITS nor SHT_NOBITS, so when changing sections we don't
6212 want to print a section type (@progbits or @nobits). If someone
6213 is silly enough to emit code or TLS variables to one of these
6214 sections, then don't handle them specially. */
6215 if (!(flags
& (SECTION_CODE
| SECTION_BSS
| SECTION_TLS
))
6216 && (strcmp (name
, ".init_array") == 0
6217 || strcmp (name
, ".fini_array") == 0
6218 || strcmp (name
, ".preinit_array") == 0))
6219 flags
|= SECTION_NOTYPE
;
6224 /* Return true if the target supports some form of global BSS,
6225 either through bss_noswitch_section, or by selecting a BSS
6226 section in TARGET_ASM_SELECT_SECTION. */
6229 have_global_bss_p (void)
6231 return bss_noswitch_section
|| targetm
.have_switchable_bss_sections
;
6234 /* Output assembly to switch to section NAME with attribute FLAGS.
6235 Four variants for common object file formats. */
6238 default_no_named_section (const char *name ATTRIBUTE_UNUSED
,
6239 unsigned int flags ATTRIBUTE_UNUSED
,
6240 tree decl ATTRIBUTE_UNUSED
)
6242 /* Some object formats don't support named sections at all. The
6243 front-end should already have flagged this as an error. */
6247 #ifndef TLS_SECTION_ASM_FLAG
6248 #define TLS_SECTION_ASM_FLAG 'T'
6252 default_elf_asm_named_section (const char *name
, unsigned int flags
,
6253 tree decl ATTRIBUTE_UNUSED
)
6255 char flagchars
[10], *f
= flagchars
;
6257 /* If we have already declared this section, we can use an
6258 abbreviated form to switch back to it -- unless this section is
6259 part of a COMDAT groups, in which case GAS requires the full
6260 declaration every time. */
6261 if (!(HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6262 && (flags
& SECTION_DECLARED
))
6264 fprintf (asm_out_file
, "\t.section\t%s\n", name
);
6268 if (!(flags
& SECTION_DEBUG
))
6270 #if defined (HAVE_GAS_SECTION_EXCLUDE) && HAVE_GAS_SECTION_EXCLUDE == 1
6271 if (flags
& SECTION_EXCLUDE
)
6274 if (flags
& SECTION_WRITE
)
6276 if (flags
& SECTION_CODE
)
6278 if (flags
& SECTION_SMALL
)
6280 if (flags
& SECTION_MERGE
)
6282 if (flags
& SECTION_STRINGS
)
6284 if (flags
& SECTION_TLS
)
6285 *f
++ = TLS_SECTION_ASM_FLAG
;
6286 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6290 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"", name
, flagchars
);
6292 if (!(flags
& SECTION_NOTYPE
))
6297 if (flags
& SECTION_BSS
)
6303 /* On platforms that use "@" as the assembly comment character,
6305 if (strcmp (ASM_COMMENT_START
, "@") == 0)
6307 fprintf (asm_out_file
, format
, type
);
6309 if (flags
& SECTION_ENTSIZE
)
6310 fprintf (asm_out_file
, ",%d", flags
& SECTION_ENTSIZE
);
6311 if (HAVE_COMDAT_GROUP
&& (flags
& SECTION_LINKONCE
))
6313 if (TREE_CODE (decl
) == IDENTIFIER_NODE
)
6314 fprintf (asm_out_file
, ",%s,comdat", IDENTIFIER_POINTER (decl
));
6316 fprintf (asm_out_file
, ",%s,comdat",
6317 IDENTIFIER_POINTER (DECL_COMDAT_GROUP (decl
)));
6321 putc ('\n', asm_out_file
);
6325 default_coff_asm_named_section (const char *name
, unsigned int flags
,
6326 tree decl ATTRIBUTE_UNUSED
)
6328 char flagchars
[8], *f
= flagchars
;
6330 if (flags
& SECTION_WRITE
)
6332 if (flags
& SECTION_CODE
)
6336 fprintf (asm_out_file
, "\t.section\t%s,\"%s\"\n", name
, flagchars
);
6340 default_pe_asm_named_section (const char *name
, unsigned int flags
,
6343 default_coff_asm_named_section (name
, flags
, decl
);
6345 if (flags
& SECTION_LINKONCE
)
6347 /* Functions may have been compiled at various levels of
6348 optimization so we can't use `same_size' here.
6349 Instead, have the linker pick one. */
6350 fprintf (asm_out_file
, "\t.linkonce %s\n",
6351 (flags
& SECTION_CODE
? "discard" : "same_size"));
6355 /* The lame default section selector. */
6358 default_select_section (tree decl
, int reloc
,
6359 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6363 if (decl_readonly_section (decl
, reloc
))
6364 return readonly_data_section
;
6366 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6368 if (! ((flag_pic
&& reloc
)
6369 || !TREE_READONLY (decl
)
6370 || TREE_SIDE_EFFECTS (decl
)
6371 || !TREE_CONSTANT (decl
)))
6372 return readonly_data_section
;
6374 else if (TREE_CODE (decl
) == STRING_CST
)
6375 return readonly_data_section
;
6376 else if (! (flag_pic
&& reloc
))
6377 return readonly_data_section
;
6379 return data_section
;
6382 enum section_category
6383 categorize_decl_for_section (const_tree decl
, int reloc
)
6385 enum section_category ret
;
6387 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6389 else if (TREE_CODE (decl
) == STRING_CST
)
6391 if ((flag_sanitize
& SANITIZE_ADDRESS
)
6392 && asan_protect_global (CONST_CAST_TREE (decl
)))
6393 /* or !flag_merge_constants */
6394 return SECCAT_RODATA
;
6396 return SECCAT_RODATA_MERGE_STR
;
6398 else if (TREE_CODE (decl
) == VAR_DECL
)
6400 if (bss_initializer_p (decl
))
6402 else if (! TREE_READONLY (decl
)
6403 || TREE_SIDE_EFFECTS (decl
)
6404 || ! TREE_CONSTANT (DECL_INITIAL (decl
)))
6406 /* Here the reloc_rw_mask is not testing whether the section should
6407 be read-only or not, but whether the dynamic link will have to
6408 do something. If so, we wish to segregate the data in order to
6409 minimize cache misses inside the dynamic linker. */
6410 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6411 ret
= reloc
== 1 ? SECCAT_DATA_REL_LOCAL
: SECCAT_DATA_REL
;
6415 else if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6416 ret
= reloc
== 1 ? SECCAT_DATA_REL_RO_LOCAL
: SECCAT_DATA_REL_RO
;
6417 else if (reloc
|| flag_merge_constants
< 2
6418 || ((flag_sanitize
& SANITIZE_ADDRESS
)
6419 && asan_protect_global (CONST_CAST_TREE (decl
))))
6420 /* C and C++ don't allow different variables to share the same
6421 location. -fmerge-all-constants allows even that (at the
6422 expense of not conforming). */
6423 ret
= SECCAT_RODATA
;
6424 else if (TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
)
6425 ret
= SECCAT_RODATA_MERGE_STR_INIT
;
6427 ret
= SECCAT_RODATA_MERGE_CONST
;
6429 else if (TREE_CODE (decl
) == CONSTRUCTOR
)
6431 if ((reloc
& targetm
.asm_out
.reloc_rw_mask ())
6432 || TREE_SIDE_EFFECTS (decl
)
6433 || ! TREE_CONSTANT (decl
))
6436 ret
= SECCAT_RODATA
;
6439 ret
= SECCAT_RODATA
;
6441 /* There are no read-only thread-local sections. */
6442 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6444 /* Note that this would be *just* SECCAT_BSS, except that there's
6445 no concept of a read-only thread-local-data section. */
6446 if (ret
== SECCAT_BSS
6447 || (flag_zero_initialized_in_bss
6448 && initializer_zerop (DECL_INITIAL (decl
))))
6454 /* If the target uses small data sections, select it. */
6455 else if (targetm
.in_small_data_p (decl
))
6457 if (ret
== SECCAT_BSS
)
6459 else if (targetm
.have_srodata_section
&& ret
== SECCAT_RODATA
)
6460 ret
= SECCAT_SRODATA
;
6469 decl_readonly_section_1 (enum section_category category
)
6474 case SECCAT_RODATA_MERGE_STR
:
6475 case SECCAT_RODATA_MERGE_STR_INIT
:
6476 case SECCAT_RODATA_MERGE_CONST
:
6477 case SECCAT_SRODATA
:
6485 decl_readonly_section (const_tree decl
, int reloc
)
6487 return decl_readonly_section_1 (categorize_decl_for_section (decl
, reloc
));
6490 /* Select a section based on the above categorization. */
6493 default_elf_select_section (tree decl
, int reloc
,
6494 unsigned HOST_WIDE_INT align
)
6497 switch (categorize_decl_for_section (decl
, reloc
))
6500 /* We're not supposed to be called on FUNCTION_DECLs. */
6503 return readonly_data_section
;
6504 case SECCAT_RODATA_MERGE_STR
:
6505 return mergeable_string_section (decl
, align
, 0);
6506 case SECCAT_RODATA_MERGE_STR_INIT
:
6507 return mergeable_string_section (DECL_INITIAL (decl
), align
, 0);
6508 case SECCAT_RODATA_MERGE_CONST
:
6509 return mergeable_constant_section (DECL_MODE (decl
), align
, 0);
6510 case SECCAT_SRODATA
:
6514 return data_section
;
6515 case SECCAT_DATA_REL
:
6516 sname
= ".data.rel";
6518 case SECCAT_DATA_REL_LOCAL
:
6519 sname
= ".data.rel.local";
6521 case SECCAT_DATA_REL_RO
:
6522 sname
= ".data.rel.ro";
6524 case SECCAT_DATA_REL_RO_LOCAL
:
6525 sname
= ".data.rel.ro.local";
6548 return get_named_section (decl
, sname
, reloc
);
6551 /* Construct a unique section name based on the decl name and the
6552 categorization performed above. */
6555 default_unique_section (tree decl
, int reloc
)
6557 /* We only need to use .gnu.linkonce if we don't have COMDAT groups. */
6558 bool one_only
= DECL_ONE_ONLY (decl
) && !HAVE_COMDAT_GROUP
;
6559 const char *prefix
, *name
, *linkonce
;
6563 switch (categorize_decl_for_section (decl
, reloc
))
6566 prefix
= one_only
? ".t" : ".text";
6569 case SECCAT_RODATA_MERGE_STR
:
6570 case SECCAT_RODATA_MERGE_STR_INIT
:
6571 case SECCAT_RODATA_MERGE_CONST
:
6572 prefix
= one_only
? ".r" : ".rodata";
6574 case SECCAT_SRODATA
:
6575 prefix
= one_only
? ".s2" : ".sdata2";
6578 prefix
= one_only
? ".d" : ".data";
6580 case SECCAT_DATA_REL
:
6581 prefix
= one_only
? ".d.rel" : ".data.rel";
6583 case SECCAT_DATA_REL_LOCAL
:
6584 prefix
= one_only
? ".d.rel.local" : ".data.rel.local";
6586 case SECCAT_DATA_REL_RO
:
6587 prefix
= one_only
? ".d.rel.ro" : ".data.rel.ro";
6589 case SECCAT_DATA_REL_RO_LOCAL
:
6590 prefix
= one_only
? ".d.rel.ro.local" : ".data.rel.ro.local";
6593 prefix
= one_only
? ".s" : ".sdata";
6596 prefix
= one_only
? ".b" : ".bss";
6599 prefix
= one_only
? ".sb" : ".sbss";
6602 prefix
= one_only
? ".td" : ".tdata";
6605 prefix
= one_only
? ".tb" : ".tbss";
6611 id
= DECL_ASSEMBLER_NAME (decl
);
6612 ultimate_transparent_alias_target (&id
);
6613 name
= IDENTIFIER_POINTER (id
);
6614 name
= targetm
.strip_name_encoding (name
);
6616 /* If we're using one_only, then there needs to be a .gnu.linkonce
6617 prefix to the section name. */
6618 linkonce
= one_only
? ".gnu.linkonce" : "";
6620 string
= ACONCAT ((linkonce
, prefix
, ".", name
, NULL
));
6622 set_decl_section_name (decl
, string
);
6625 /* Subroutine of compute_reloc_for_rtx for leaf rtxes. */
6628 compute_reloc_for_rtx_1 (const_rtx x
)
6630 switch (GET_CODE (x
))
6633 return SYMBOL_REF_LOCAL_P (x
) ? 1 : 2;
6641 /* Like compute_reloc_for_constant, except for an RTX. The return value
6642 is a mask for which bit 1 indicates a global relocation, and bit 0
6643 indicates a local relocation. */
6646 compute_reloc_for_rtx (const_rtx x
)
6648 switch (GET_CODE (x
))
6652 return compute_reloc_for_rtx_1 (x
);
6657 subrtx_iterator::array_type array
;
6658 FOR_EACH_SUBRTX (iter
, array
, x
, ALL
)
6659 reloc
|= compute_reloc_for_rtx_1 (*iter
);
6669 default_select_rtx_section (machine_mode mode ATTRIBUTE_UNUSED
,
6671 unsigned HOST_WIDE_INT align ATTRIBUTE_UNUSED
)
6673 if (compute_reloc_for_rtx (x
) & targetm
.asm_out
.reloc_rw_mask ())
6674 return data_section
;
6676 return readonly_data_section
;
6680 default_elf_select_rtx_section (machine_mode mode
, rtx x
,
6681 unsigned HOST_WIDE_INT align
)
6683 int reloc
= compute_reloc_for_rtx (x
);
6685 /* ??? Handle small data here somehow. */
6687 if (reloc
& targetm
.asm_out
.reloc_rw_mask ())
6690 return get_named_section (NULL
, ".data.rel.ro.local", 1);
6692 return get_named_section (NULL
, ".data.rel.ro", 3);
6695 return mergeable_constant_section (mode
, align
, 0);
6698 /* Set the generally applicable flags on the SYMBOL_REF for EXP. */
6701 default_encode_section_info (tree decl
, rtx rtl
, int first ATTRIBUTE_UNUSED
)
6706 /* Careful not to prod global register variables. */
6709 symbol
= XEXP (rtl
, 0);
6710 if (GET_CODE (symbol
) != SYMBOL_REF
)
6713 flags
= SYMBOL_REF_FLAGS (symbol
) & SYMBOL_FLAG_HAS_BLOCK_INFO
;
6714 if (TREE_CODE (decl
) == FUNCTION_DECL
)
6715 flags
|= SYMBOL_FLAG_FUNCTION
;
6716 if (targetm
.binds_local_p (decl
))
6717 flags
|= SYMBOL_FLAG_LOCAL
;
6718 if (TREE_CODE (decl
) == VAR_DECL
&& DECL_THREAD_LOCAL_P (decl
))
6719 flags
|= DECL_TLS_MODEL (decl
) << SYMBOL_FLAG_TLS_SHIFT
;
6720 else if (targetm
.in_small_data_p (decl
))
6721 flags
|= SYMBOL_FLAG_SMALL
;
6722 /* ??? Why is DECL_EXTERNAL ever set for non-PUBLIC names? Without
6723 being PUBLIC, the thing *must* be defined in this translation unit.
6724 Prevent this buglet from being propagated into rtl code as well. */
6725 if (DECL_P (decl
) && DECL_EXTERNAL (decl
) && TREE_PUBLIC (decl
))
6726 flags
|= SYMBOL_FLAG_EXTERNAL
;
6728 SYMBOL_REF_FLAGS (symbol
) = flags
;
6731 /* By default, we do nothing for encode_section_info, so we need not
6732 do anything but discard the '*' marker. */
6735 default_strip_name_encoding (const char *str
)
6737 return str
+ (*str
== '*');
6740 #ifdef ASM_OUTPUT_DEF
6741 /* The default implementation of TARGET_ASM_OUTPUT_ANCHOR. Define the
6742 anchor relative to ".", the current section position. */
6745 default_asm_output_anchor (rtx symbol
)
6749 sprintf (buffer
, "*. + " HOST_WIDE_INT_PRINT_DEC
,
6750 SYMBOL_REF_BLOCK_OFFSET (symbol
));
6751 ASM_OUTPUT_DEF (asm_out_file
, XSTR (symbol
, 0), buffer
);
6755 /* The default implementation of TARGET_USE_ANCHORS_FOR_SYMBOL_P. */
6758 default_use_anchors_for_symbol_p (const_rtx symbol
)
6763 /* Don't use anchors for mergeable sections. The linker might move
6764 the objects around. */
6765 sect
= SYMBOL_REF_BLOCK (symbol
)->sect
;
6766 if (sect
->common
.flags
& SECTION_MERGE
)
6769 /* Don't use anchors for small data sections. The small data register
6770 acts as an anchor for such sections. */
6771 if (sect
->common
.flags
& SECTION_SMALL
)
6774 decl
= SYMBOL_REF_DECL (symbol
);
6775 if (decl
&& DECL_P (decl
))
6777 /* Don't use section anchors for decls that might be defined or
6778 usurped by other modules. */
6779 if (TREE_PUBLIC (decl
) && !decl_binds_to_current_def_p (decl
))
6782 /* Don't use section anchors for decls that will be placed in a
6783 small data section. */
6784 /* ??? Ideally, this check would be redundant with the SECTION_SMALL
6785 one above. The problem is that we only use SECTION_SMALL for
6786 sections that should be marked as small in the section directive. */
6787 if (targetm
.in_small_data_p (decl
))
6793 /* Return true when RESOLUTION indicate that symbol will be bound to the
6794 definition provided by current .o file. */
6797 resolution_to_local_definition_p (enum ld_plugin_symbol_resolution resolution
)
6799 return (resolution
== LDPR_PREVAILING_DEF
6800 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6801 || resolution
== LDPR_PREVAILING_DEF_IRONLY
);
6804 /* Return true when RESOLUTION indicate that symbol will be bound locally
6805 within current executable or DSO. */
6808 resolution_local_p (enum ld_plugin_symbol_resolution resolution
)
6810 return (resolution
== LDPR_PREVAILING_DEF
6811 || resolution
== LDPR_PREVAILING_DEF_IRONLY
6812 || resolution
== LDPR_PREVAILING_DEF_IRONLY_EXP
6813 || resolution
== LDPR_PREEMPTED_REG
6814 || resolution
== LDPR_PREEMPTED_IR
6815 || resolution
== LDPR_RESOLVED_IR
6816 || resolution
== LDPR_RESOLVED_EXEC
);
6819 /* COMMON_LOCAL_P is true means that the linker can guarantee that an
6820 uninitialized common symbol in the executable will still be defined
6821 (through COPY relocation) in the executable. */
6824 default_binds_local_p_3 (const_tree exp
, bool shlib
, bool weak_dominate
,
6825 bool extern_protected_data
, bool common_local_p
)
6827 /* A non-decl is an entry in the constant pool. */
6831 /* Weakrefs may not bind locally, even though the weakref itself is always
6832 static and therefore local. Similarly, the resolver for ifunc functions
6833 might resolve to a non-local function.
6834 FIXME: We can resolve the weakref case more curefuly by looking at the
6836 if (lookup_attribute ("weakref", DECL_ATTRIBUTES (exp
))
6837 || (TREE_CODE (exp
) == FUNCTION_DECL
6838 && lookup_attribute ("ifunc", DECL_ATTRIBUTES (exp
))))
6841 /* Static variables are always local. */
6842 if (! TREE_PUBLIC (exp
))
6845 /* With resolution file in hand, take look into resolutions.
6846 We can't just return true for resolved_locally symbols,
6847 because dynamic linking might overwrite symbols
6848 in shared libraries. */
6849 bool resolved_locally
= false;
6851 bool uninited_common
= (DECL_COMMON (exp
)
6852 && (DECL_INITIAL (exp
) == NULL
6854 && DECL_INITIAL (exp
) == error_mark_node
)));
6856 /* A non-external variable is defined locally only if it isn't
6857 uninitialized COMMON variable or common_local_p is true. */
6858 bool defined_locally
= (!DECL_EXTERNAL (exp
)
6859 && (!uninited_common
|| common_local_p
));
6860 if (symtab_node
*node
= symtab_node::get (exp
))
6862 if (node
->in_other_partition
)
6863 defined_locally
= true;
6864 if (resolution_to_local_definition_p (node
->resolution
))
6865 defined_locally
= resolved_locally
= true;
6866 else if (resolution_local_p (node
->resolution
))
6867 resolved_locally
= true;
6869 if (defined_locally
&& weak_dominate
&& !shlib
)
6870 resolved_locally
= true;
6872 /* Undefined weak symbols are never defined locally. */
6873 if (DECL_WEAK (exp
) && !defined_locally
)
6876 /* A symbol is local if the user has said explicitly that it will be,
6877 or if we have a definition for the symbol. We cannot infer visibility
6878 for undefined symbols. */
6879 if (DECL_VISIBILITY (exp
) != VISIBILITY_DEFAULT
6880 && (TREE_CODE (exp
) == FUNCTION_DECL
6881 || !extern_protected_data
6882 || DECL_VISIBILITY (exp
) != VISIBILITY_PROTECTED
)
6883 && (DECL_VISIBILITY_SPECIFIED (exp
) || defined_locally
))
6886 /* If PIC, then assume that any global name can be overridden by
6887 symbols resolved from other modules. */
6891 /* Variables defined outside this object might not be local. */
6892 if (DECL_EXTERNAL (exp
) && !resolved_locally
)
6895 /* Non-dominant weak symbols are not defined locally. */
6896 if (DECL_WEAK (exp
) && !resolved_locally
)
6899 /* Uninitialized COMMON variable may be unified with symbols
6900 resolved from other modules. */
6901 if (uninited_common
&& !resolved_locally
)
6904 /* Otherwise we're left with initialized (or non-common) global data
6905 which is of necessity defined locally. */
6909 /* Assume ELF-ish defaults, since that's pretty much the most liberal
6910 wrt cross-module name binding. */
6913 default_binds_local_p (const_tree exp
)
6915 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false, false);
6918 /* Similar to default_binds_local_p, but common symbol may be local. */
6921 default_binds_local_p_2 (const_tree exp
)
6923 return default_binds_local_p_3 (exp
, flag_shlib
!= 0, true, false,
6928 default_binds_local_p_1 (const_tree exp
, int shlib
)
6930 return default_binds_local_p_3 (exp
, shlib
!= 0, false, false, false);
6933 /* Return true when references to DECL must bind to current definition in
6936 The condition is usually equivalent to whether the function binds to the
6937 current module (shared library or executable), that is to binds_local_p.
6938 We use this fact to avoid need for another target hook and implement
6939 the logic using binds_local_p and just special cases where
6940 decl_binds_to_current_def_p is stronger than binds_local_p. In particular
6941 the weak definitions (that can be overwritten at linktime by other
6942 definition from different object file) and when resolution info is available
6943 we simply use the knowledge passed to us by linker plugin. */
6945 decl_binds_to_current_def_p (const_tree decl
)
6947 gcc_assert (DECL_P (decl
));
6948 if (!targetm
.binds_local_p (decl
))
6950 if (!TREE_PUBLIC (decl
))
6953 /* When resolution is available, just use it. */
6954 if (symtab_node
*node
= symtab_node::get (decl
))
6956 if (node
->resolution
!= LDPR_UNKNOWN
)
6957 return resolution_to_local_definition_p (node
->resolution
);
6960 /* Otherwise we have to assume the worst for DECL_WEAK (hidden weaks
6961 binds locally but still can be overwritten), DECL_COMMON (can be merged
6962 with a non-common definition somewhere in the same module) or
6964 This rely on fact that binds_local_p behave as decl_replaceable_p
6965 for all other declaration types. */
6966 if (DECL_WEAK (decl
))
6968 if (DECL_COMMON (decl
)
6969 && (DECL_INITIAL (decl
) == NULL
6970 || (!in_lto_p
&& DECL_INITIAL (decl
) == error_mark_node
)))
6972 if (DECL_EXTERNAL (decl
))
6977 /* A replaceable function or variable is one which may be replaced
6978 at link-time with an entirely different definition, provided that the
6979 replacement has the same type. For example, functions declared
6980 with __attribute__((weak)) on most systems are replaceable.
6982 COMDAT functions are not replaceable, since all definitions of the
6983 function must be equivalent. It is important that COMDAT functions
6984 not be treated as replaceable so that use of C++ template
6985 instantiations is not penalized. */
6988 decl_replaceable_p (tree decl
)
6990 gcc_assert (DECL_P (decl
));
6991 if (!TREE_PUBLIC (decl
) || DECL_COMDAT (decl
))
6993 if (!flag_semantic_interposition
6994 && !DECL_WEAK (decl
))
6996 return !decl_binds_to_current_def_p (decl
);
6999 /* Default function to output code that will globalize a label. A
7000 target must define GLOBAL_ASM_OP or provide its own function to
7001 globalize a label. */
7002 #ifdef GLOBAL_ASM_OP
7004 default_globalize_label (FILE * stream
, const char *name
)
7006 fputs (GLOBAL_ASM_OP
, stream
);
7007 assemble_name (stream
, name
);
7008 putc ('\n', stream
);
7010 #endif /* GLOBAL_ASM_OP */
7012 /* Default function to output code that will globalize a declaration. */
7014 default_globalize_decl_name (FILE * stream
, tree decl
)
7016 const char *name
= XSTR (XEXP (DECL_RTL (decl
), 0), 0);
7017 targetm
.asm_out
.globalize_label (stream
, name
);
7020 /* Default function to output a label for unwind information. The
7021 default is to do nothing. A target that needs nonlocal labels for
7022 unwind information must provide its own function to do this. */
7024 default_emit_unwind_label (FILE * stream ATTRIBUTE_UNUSED
,
7025 tree decl ATTRIBUTE_UNUSED
,
7026 int for_eh ATTRIBUTE_UNUSED
,
7027 int empty ATTRIBUTE_UNUSED
)
7031 /* Default function to output a label to divide up the exception table.
7032 The default is to do nothing. A target that needs/wants to divide
7033 up the table must provide it's own function to do this. */
7035 default_emit_except_table_label (FILE * stream ATTRIBUTE_UNUSED
)
7039 /* This is how to output an internal numbered label where PREFIX is
7040 the class of label and LABELNO is the number within the class. */
7043 default_generate_internal_label (char *buf
, const char *prefix
,
7044 unsigned long labelno
)
7046 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7049 /* This is how to output an internal numbered label where PREFIX is
7050 the class of label and LABELNO is the number within the class. */
7053 default_internal_label (FILE *stream
, const char *prefix
,
7054 unsigned long labelno
)
7056 char *const buf
= (char *) alloca (40 + strlen (prefix
));
7057 ASM_GENERATE_INTERNAL_LABEL (buf
, prefix
, labelno
);
7058 ASM_OUTPUT_INTERNAL_LABEL (stream
, buf
);
7062 /* The default implementation of ASM_DECLARE_CONSTANT_NAME. */
7065 default_asm_declare_constant_name (FILE *file
, const char *name
,
7066 const_tree exp ATTRIBUTE_UNUSED
,
7067 HOST_WIDE_INT size ATTRIBUTE_UNUSED
)
7069 assemble_label (file
, name
);
7072 /* This is the default behavior at the beginning of a file. It's
7073 controlled by two other target-hook toggles. */
7075 default_file_start (void)
7077 if (targetm
.asm_file_start_app_off
7078 && !(flag_verbose_asm
|| flag_debug_asm
|| flag_dump_rtl_in_asm
))
7079 fputs (ASM_APP_OFF
, asm_out_file
);
7081 if (targetm
.asm_file_start_file_directive
)
7083 /* LTO produced units have no meaningful main_input_filename. */
7085 output_file_directive (asm_out_file
, "<artificial>");
7087 output_file_directive (asm_out_file
, main_input_filename
);
7091 /* This is a generic routine suitable for use as TARGET_ASM_FILE_END
7092 which emits a special section directive used to indicate whether or
7093 not this object file needs an executable stack. This is primarily
7094 a GNU extension to ELF but could be used on other targets. */
7096 int trampolines_created
;
7099 file_end_indicate_exec_stack (void)
7101 unsigned int flags
= SECTION_DEBUG
;
7102 if (trampolines_created
)
7103 flags
|= SECTION_CODE
;
7105 switch_to_section (get_section (".note.GNU-stack", flags
, NULL
));
7108 /* Emit a special section directive to indicate that this object file
7109 was compiled with -fsplit-stack. This is used to let the linker
7110 detect calls between split-stack code and non-split-stack code, so
7111 that it can modify the split-stack code to allocate a sufficiently
7112 large stack. We emit another special section if there are any
7113 functions in this file which have the no_split_stack attribute, to
7114 prevent the linker from warning about being unable to convert the
7115 functions if they call non-split-stack code. */
7118 file_end_indicate_split_stack (void)
7120 if (flag_split_stack
)
7122 switch_to_section (get_section (".note.GNU-split-stack", SECTION_DEBUG
,
7124 if (saw_no_split_stack
)
7125 switch_to_section (get_section (".note.GNU-no-split-stack",
7126 SECTION_DEBUG
, NULL
));
7130 /* Output DIRECTIVE (a C string) followed by a newline. This is used as
7131 a get_unnamed_section callback. */
7134 output_section_asm_op (const void *directive
)
7136 fprintf (asm_out_file
, "%s\n", (const char *) directive
);
7139 /* Emit assembly code to switch to section NEW_SECTION. Do nothing if
7140 the current section is NEW_SECTION. */
7143 switch_to_section (section
*new_section
)
7145 if (in_section
== new_section
)
7148 if (new_section
->common
.flags
& SECTION_FORGET
)
7151 in_section
= new_section
;
7153 switch (SECTION_STYLE (new_section
))
7156 targetm
.asm_out
.named_section (new_section
->named
.name
,
7157 new_section
->named
.common
.flags
,
7158 new_section
->named
.decl
);
7161 case SECTION_UNNAMED
:
7162 new_section
->unnamed
.callback (new_section
->unnamed
.data
);
7165 case SECTION_NOSWITCH
:
7170 new_section
->common
.flags
|= SECTION_DECLARED
;
7173 /* If block symbol SYMBOL has not yet been assigned an offset, place
7174 it at the end of its block. */
7177 place_block_symbol (rtx symbol
)
7179 unsigned HOST_WIDE_INT size
, mask
, offset
;
7180 struct constant_descriptor_rtx
*desc
;
7181 unsigned int alignment
;
7182 struct object_block
*block
;
7185 gcc_assert (SYMBOL_REF_BLOCK (symbol
));
7186 if (SYMBOL_REF_BLOCK_OFFSET (symbol
) >= 0)
7189 /* Work out the symbol's size and alignment. */
7190 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7192 desc
= SYMBOL_REF_CONSTANT (symbol
);
7193 alignment
= desc
->align
;
7194 size
= GET_MODE_SIZE (desc
->mode
);
7196 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7198 decl
= SYMBOL_REF_DECL (symbol
);
7199 gcc_checking_assert (DECL_IN_CONSTANT_POOL (decl
));
7200 alignment
= DECL_ALIGN (decl
);
7201 size
= get_constant_size (DECL_INITIAL (decl
));
7202 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7203 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7204 && asan_protect_global (DECL_INITIAL (decl
)))
7205 size
+= asan_red_zone_size (size
);
7209 struct symtab_node
*snode
;
7210 decl
= SYMBOL_REF_DECL (symbol
);
7212 snode
= symtab_node::get (decl
);
7215 rtx target
= DECL_RTL (snode
->ultimate_alias_target ()->decl
);
7217 gcc_assert (MEM_P (target
)
7218 && GET_CODE (XEXP (target
, 0)) == SYMBOL_REF
7219 && SYMBOL_REF_HAS_BLOCK_INFO_P (XEXP (target
, 0)));
7220 target
= XEXP (target
, 0);
7221 place_block_symbol (target
);
7222 SYMBOL_REF_BLOCK_OFFSET (symbol
) = SYMBOL_REF_BLOCK_OFFSET (target
);
7225 alignment
= get_variable_align (decl
);
7226 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7227 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7228 && asan_protect_global (decl
))
7230 size
+= asan_red_zone_size (size
);
7231 alignment
= MAX (alignment
,
7232 ASAN_RED_ZONE_SIZE
* BITS_PER_UNIT
);
7236 /* Calculate the object's offset from the start of the block. */
7237 block
= SYMBOL_REF_BLOCK (symbol
);
7238 mask
= alignment
/ BITS_PER_UNIT
- 1;
7239 offset
= (block
->size
+ mask
) & ~mask
;
7240 SYMBOL_REF_BLOCK_OFFSET (symbol
) = offset
;
7242 /* Record the block's new alignment and size. */
7243 block
->alignment
= MAX (block
->alignment
, alignment
);
7244 block
->size
= offset
+ size
;
7246 vec_safe_push (block
->objects
, symbol
);
7249 /* Return the anchor that should be used to address byte offset OFFSET
7250 from the first object in BLOCK. MODEL is the TLS model used
7254 get_section_anchor (struct object_block
*block
, HOST_WIDE_INT offset
,
7255 enum tls_model model
)
7258 unsigned int begin
, middle
, end
;
7259 unsigned HOST_WIDE_INT min_offset
, max_offset
, range
, bias
, delta
;
7262 /* Work out the anchor's offset. Use an offset of 0 for the first
7263 anchor so that we don't pessimize the case where we take the address
7264 of a variable at the beginning of the block. This is particularly
7265 useful when a block has only one variable assigned to it.
7267 We try to place anchors RANGE bytes apart, so there can then be
7268 anchors at +/-RANGE, +/-2 * RANGE, and so on, up to the limits of
7269 a ptr_mode offset. With some target settings, the lowest such
7270 anchor might be out of range for the lowest ptr_mode offset;
7271 likewise the highest anchor for the highest offset. Use anchors
7272 at the extreme ends of the ptr_mode range in such cases.
7274 All arithmetic uses unsigned integers in order to avoid
7276 max_offset
= (unsigned HOST_WIDE_INT
) targetm
.max_anchor_offset
;
7277 min_offset
= (unsigned HOST_WIDE_INT
) targetm
.min_anchor_offset
;
7278 range
= max_offset
- min_offset
+ 1;
7283 bias
= HOST_WIDE_INT_1U
<< (GET_MODE_BITSIZE (ptr_mode
) - 1);
7286 delta
= -(unsigned HOST_WIDE_INT
) offset
+ max_offset
;
7287 delta
-= delta
% range
;
7290 offset
= (HOST_WIDE_INT
) (-delta
);
7294 delta
= (unsigned HOST_WIDE_INT
) offset
- min_offset
;
7295 delta
-= delta
% range
;
7296 if (delta
> bias
- 1)
7298 offset
= (HOST_WIDE_INT
) delta
;
7302 /* Do a binary search to see if there's already an anchor we can use.
7303 Set BEGIN to the new anchor's index if not. */
7305 end
= vec_safe_length (block
->anchors
);
7306 while (begin
!= end
)
7308 middle
= (end
+ begin
) / 2;
7309 anchor
= (*block
->anchors
)[middle
];
7310 if (SYMBOL_REF_BLOCK_OFFSET (anchor
) > offset
)
7312 else if (SYMBOL_REF_BLOCK_OFFSET (anchor
) < offset
)
7314 else if (SYMBOL_REF_TLS_MODEL (anchor
) > model
)
7316 else if (SYMBOL_REF_TLS_MODEL (anchor
) < model
)
7322 /* Create a new anchor with a unique label. */
7323 ASM_GENERATE_INTERNAL_LABEL (label
, "LANCHOR", anchor_labelno
++);
7324 anchor
= create_block_symbol (ggc_strdup (label
), block
, offset
);
7325 SYMBOL_REF_FLAGS (anchor
) |= SYMBOL_FLAG_LOCAL
| SYMBOL_FLAG_ANCHOR
;
7326 SYMBOL_REF_FLAGS (anchor
) |= model
<< SYMBOL_FLAG_TLS_SHIFT
;
7328 /* Insert it at index BEGIN. */
7329 vec_safe_insert (block
->anchors
, begin
, anchor
);
7333 /* Output the objects in BLOCK. */
7336 output_object_block (struct object_block
*block
)
7338 struct constant_descriptor_rtx
*desc
;
7340 HOST_WIDE_INT offset
;
7344 if (!block
->objects
)
7347 /* Switch to the section and make sure that the first byte is
7348 suitably aligned. */
7349 switch_to_section (block
->sect
);
7350 assemble_align (block
->alignment
);
7352 /* Define the values of all anchors relative to the current section
7354 FOR_EACH_VEC_SAFE_ELT (block
->anchors
, i
, symbol
)
7355 targetm
.asm_out
.output_anchor (symbol
);
7357 /* Output the objects themselves. */
7359 FOR_EACH_VEC_ELT (*block
->objects
, i
, symbol
)
7361 /* Move to the object's offset, padding with zeros if necessary. */
7362 assemble_zeros (SYMBOL_REF_BLOCK_OFFSET (symbol
) - offset
);
7363 offset
= SYMBOL_REF_BLOCK_OFFSET (symbol
);
7364 if (CONSTANT_POOL_ADDRESS_P (symbol
))
7366 desc
= SYMBOL_REF_CONSTANT (symbol
);
7367 /* Pass 1 for align as we have already laid out everything in the block.
7368 So aligning shouldn't be necessary. */
7369 output_constant_pool_1 (desc
, 1);
7370 offset
+= GET_MODE_SIZE (desc
->mode
);
7372 else if (TREE_CONSTANT_POOL_ADDRESS_P (symbol
))
7375 decl
= SYMBOL_REF_DECL (symbol
);
7376 assemble_constant_contents
7377 (DECL_INITIAL (decl
), XSTR (symbol
, 0), DECL_ALIGN (decl
));
7379 size
= get_constant_size (DECL_INITIAL (decl
));
7381 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7382 && TREE_CODE (DECL_INITIAL (decl
)) == STRING_CST
7383 && asan_protect_global (DECL_INITIAL (decl
)))
7385 size
= asan_red_zone_size (size
);
7386 assemble_zeros (size
);
7393 decl
= SYMBOL_REF_DECL (symbol
);
7394 assemble_variable_contents (decl
, XSTR (symbol
, 0), false);
7395 size
= tree_to_uhwi (DECL_SIZE_UNIT (decl
));
7397 if ((flag_sanitize
& SANITIZE_ADDRESS
)
7398 && asan_protect_global (decl
))
7400 size
= asan_red_zone_size (size
);
7401 assemble_zeros (size
);
7408 /* A callback for qsort to compare object_blocks. */
7411 output_object_block_compare (const void *x
, const void *y
)
7413 object_block
*p1
= *(object_block
* const*)x
;
7414 object_block
*p2
= *(object_block
* const*)y
;
7416 if (p1
->sect
->common
.flags
& SECTION_NAMED
7417 && !(p2
->sect
->common
.flags
& SECTION_NAMED
))
7420 if (!(p1
->sect
->common
.flags
& SECTION_NAMED
)
7421 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7424 if (p1
->sect
->common
.flags
& SECTION_NAMED
7425 && p2
->sect
->common
.flags
& SECTION_NAMED
)
7426 return strcmp (p1
->sect
->named
.name
, p2
->sect
->named
.name
);
7428 unsigned f1
= p1
->sect
->common
.flags
;
7429 unsigned f2
= p2
->sect
->common
.flags
;
7432 return f1
< f2
? -1 : 1;
7435 /* Output the definitions of all object_blocks. */
7438 output_object_blocks (void)
7440 vec
<object_block
*, va_heap
> v
;
7441 v
.create (object_block_htab
->elements ());
7443 hash_table
<object_block_hasher
>::iterator hi
;
7445 FOR_EACH_HASH_TABLE_ELEMENT (*object_block_htab
, obj
, object_block
*, hi
)
7448 /* Sort them in order to output them in a deterministic manner,
7449 otherwise we may get .rodata sections in different orders with
7451 v
.qsort (output_object_block_compare
);
7453 FOR_EACH_VEC_ELT (v
, i
, obj
)
7454 output_object_block (obj
);
7459 /* This function provides a possible implementation of the
7460 TARGET_ASM_RECORD_GCC_SWITCHES target hook for ELF targets. When triggered
7461 by -frecord-gcc-switches it creates a new mergeable, string section in the
7462 assembler output file called TARGET_ASM_RECORD_GCC_SWITCHES_SECTION which
7463 contains the switches in ASCII format.
7465 FIXME: This code does not correctly handle double quote characters
7466 that appear inside strings, (it strips them rather than preserving them).
7467 FIXME: ASM_OUTPUT_ASCII, as defined in config/elfos.h will not emit NUL
7468 characters - instead it treats them as sub-string separators. Since
7469 we want to emit NUL strings terminators into the object file we have to use
7473 elf_record_gcc_switches (print_switch_type type
, const char * name
)
7477 case SWITCH_TYPE_PASSED
:
7478 ASM_OUTPUT_ASCII (asm_out_file
, name
, strlen (name
));
7479 ASM_OUTPUT_SKIP (asm_out_file
, (unsigned HOST_WIDE_INT
) 1);
7482 case SWITCH_TYPE_DESCRIPTIVE
:
7485 /* Distinguish between invocations where name is NULL. */
7486 static bool started
= false;
7492 sec
= get_section (targetm
.asm_out
.record_gcc_switches_section
,
7496 | (SECTION_ENTSIZE
& 1),
7498 switch_to_section (sec
);
7507 /* The return value is currently ignored by the caller, but must be 0.
7508 For -fverbose-asm the return value would be the number of characters
7509 emitted into the assembler file. */
7513 /* Emit text to declare externally defined symbols. It is needed to
7514 properly support non-default visibility. */
7516 default_elf_asm_output_external (FILE *file ATTRIBUTE_UNUSED
,
7518 const char *name ATTRIBUTE_UNUSED
)
7520 /* We output the name if and only if TREE_SYMBOL_REFERENCED is
7521 set in order to avoid putting out names that are never really
7522 used. Always output visibility specified in the source. */
7523 if (TREE_SYMBOL_REFERENCED (DECL_ASSEMBLER_NAME (decl
))
7524 && (DECL_VISIBILITY_SPECIFIED (decl
)
7525 || targetm
.binds_local_p (decl
)))
7526 maybe_assemble_visibility (decl
);
7529 /* The default hook for TARGET_ASM_OUTPUT_SOURCE_FILENAME. */
7532 default_asm_output_source_filename (FILE *file
, const char *name
)
7534 #ifdef ASM_OUTPUT_SOURCE_FILENAME
7535 ASM_OUTPUT_SOURCE_FILENAME (file
, name
);
7537 fprintf (file
, "\t.file\t");
7538 output_quoted_string (file
, name
);
7543 /* Output a file name in the form wanted by System V. */
7546 output_file_directive (FILE *asm_file
, const char *input_name
)
7551 if (input_name
== NULL
)
7552 input_name
= "<stdin>";
7554 input_name
= remap_debug_filename (input_name
);
7556 len
= strlen (input_name
);
7557 na
= input_name
+ len
;
7559 /* NA gets INPUT_NAME sans directory names. */
7560 while (na
> input_name
)
7562 if (IS_DIR_SEPARATOR (na
[-1]))
7567 targetm
.asm_out
.output_source_filename (asm_file
, na
);
7570 /* Create a DEBUG_EXPR_DECL / DEBUG_EXPR pair from RTL expression
7573 make_debug_expr_from_rtl (const_rtx exp
)
7575 tree ddecl
= make_node (DEBUG_EXPR_DECL
), type
;
7576 machine_mode mode
= GET_MODE (exp
);
7579 DECL_ARTIFICIAL (ddecl
) = 1;
7580 if (REG_P (exp
) && REG_EXPR (exp
))
7581 type
= TREE_TYPE (REG_EXPR (exp
));
7582 else if (MEM_P (exp
) && MEM_EXPR (exp
))
7583 type
= TREE_TYPE (MEM_EXPR (exp
));
7586 if (type
&& TYPE_MODE (type
) == mode
)
7587 TREE_TYPE (ddecl
) = type
;
7589 TREE_TYPE (ddecl
) = lang_hooks
.types
.type_for_mode (mode
, 1);
7590 DECL_MODE (ddecl
) = mode
;
7591 dval
= gen_rtx_DEBUG_EXPR (mode
);
7592 DEBUG_EXPR_TREE_DECL (dval
) = ddecl
;
7593 SET_DECL_RTL (ddecl
, dval
);
7597 #ifdef ELF_ASCII_ESCAPES
7598 /* Default ASM_OUTPUT_LIMITED_STRING for ELF targets. */
7601 default_elf_asm_output_limited_string (FILE *f
, const char *s
)
7606 fputs (STRING_ASM_OP
, f
);
7611 escape
= ELF_ASCII_ESCAPES
[c
];
7618 /* TODO: Print in hex with fast function, important for -flto. */
7619 fprintf (f
, "\\%03o", c
);
7632 /* Default ASM_OUTPUT_ASCII for ELF targets. */
7635 default_elf_asm_output_ascii (FILE *f
, const char *s
, unsigned int len
)
7637 const char *limit
= s
+ len
;
7638 const char *last_null
= NULL
;
7639 unsigned bytes_in_chunk
= 0;
7643 for (; s
< limit
; s
++)
7647 if (bytes_in_chunk
>= 60)
7656 for (p
= s
; p
< limit
&& *p
!= '\0'; p
++)
7663 if (p
< limit
&& (p
- s
) <= (long) ELF_STRING_LIMIT
)
7665 if (bytes_in_chunk
> 0)
7672 default_elf_asm_output_limited_string (f
, s
);
7677 if (bytes_in_chunk
== 0)
7678 fputs (ASCII_DATA_ASM_OP
"\"", f
);
7681 escape
= ELF_ASCII_ESCAPES
[c
];
7689 /* TODO: Print in hex with fast function, important for -flto. */
7690 fprintf (f
, "\\%03o", c
);
7691 bytes_in_chunk
+= 4;
7696 bytes_in_chunk
+= 2;
7703 if (bytes_in_chunk
> 0)
7711 static GTY(()) section
*elf_init_array_section
;
7712 static GTY(()) section
*elf_fini_array_section
;
7715 get_elf_initfini_array_priority_section (int priority
,
7719 if (priority
!= DEFAULT_INIT_PRIORITY
)
7722 sprintf (buf
, "%s.%.5u",
7723 constructor_p
? ".init_array" : ".fini_array",
7725 sec
= get_section (buf
, SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7731 if (elf_init_array_section
== NULL
)
7732 elf_init_array_section
7733 = get_section (".init_array",
7734 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7735 sec
= elf_init_array_section
;
7739 if (elf_fini_array_section
== NULL
)
7740 elf_fini_array_section
7741 = get_section (".fini_array",
7742 SECTION_WRITE
| SECTION_NOTYPE
, NULL_TREE
);
7743 sec
= elf_fini_array_section
;
7749 /* Use .init_array section for constructors. */
7752 default_elf_init_array_asm_out_constructor (rtx symbol
, int priority
)
7754 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7756 assemble_addr_to_section (symbol
, sec
);
7759 /* Use .fini_array section for destructors. */
7762 default_elf_fini_array_asm_out_destructor (rtx symbol
, int priority
)
7764 section
*sec
= get_elf_initfini_array_priority_section (priority
,
7766 assemble_addr_to_section (symbol
, sec
);
7769 /* Default TARGET_ASM_OUTPUT_IDENT hook.
7771 This is a bit of a cheat. The real default is a no-op, but this
7772 hook is the default for all targets with a .ident directive. */
7775 default_asm_output_ident_directive (const char *ident_str
)
7777 const char *ident_asm_op
= "\t.ident\t";
7779 /* If we are still in the front end, do not write out the string
7780 to asm_out_file. Instead, add a fake top-level asm statement.
7781 This allows the front ends to use this hook without actually
7782 writing to asm_out_file, to handle #ident or Pragma Ident. */
7783 if (symtab
->state
== PARSING
)
7785 char *buf
= ACONCAT ((ident_asm_op
, "\"", ident_str
, "\"\n", NULL
));
7786 symtab
->finalize_toplevel_asm (build_string (strlen (buf
), buf
));
7789 fprintf (asm_out_file
, "%s\"%s\"\n", ident_asm_op
, ident_str
);
7792 #include "gt-varasm.h"